Pregnancy

What is Pregnancy?

Pregnancy is a natural biological process that begins when a fertilized egg implants in the lining of the uterus. During the next 40 weeks, the body undergoes significant changes to support the growth and development of a baby. Hormones shift dramatically, blood volume increases by up to 50 percent, and organs adapt to meet the needs of both mother and developing fetus.

Understanding what happens during pregnancy helps you make informed decisions about prenatal care and testing. Blood tests play an important role in monitoring maternal health and fetal development throughout all three trimesters. These tests measure specific biomarkers that change during pregnancy, providing valuable information about how both mother and baby are doing.

Pregnancy affects nearly every system in the body, from thyroid function to liver production of binding proteins. Knowing your biomarker levels helps your healthcare team identify any concerns early and ensure you receive appropriate care. A proactive approach to prenatal testing supports the healthiest possible outcomes for both you and your baby.

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Symptoms

Missed menstrual period
Nausea or vomiting, especially in the morning
Breast tenderness and swelling
Increased urination frequency
Fatigue and increased need for sleep
Food cravings or aversions
Mood changes and emotional sensitivity
Mild cramping or spotting during implantation
Heightened sense of smell
Bloating and digestive changes

Some people experience very few symptoms in early pregnancy. Others may have symptoms before they realize they are pregnant. Each pregnancy is different, and symptom severity varies widely from person to person.

Causes and risk factors

Pregnancy occurs when sperm fertilizes an egg, typically during ovulation in the middle of the menstrual cycle. The fertilized egg then travels down the fallopian tube and implants in the uterine lining, usually 6 to 10 days after fertilization. Once implantation happens, the body begins producing human chorionic gonadotropin, the hormone that pregnancy tests detect. Factors that increase the likelihood of pregnancy include having unprotected intercourse during the fertile window, which is typically the five days before ovulation and the day of ovulation itself.

Fertility and the ability to conceive vary based on age, overall health, and reproductive health. Women are most fertile in their 20s and early 30s. Fertility gradually declines after age 35 and more rapidly after 40. Other factors that can affect conception include body weight, stress levels, smoking, alcohol use, and certain medical conditions like polycystic ovary syndrome or thyroid disorders. Understanding your body and tracking your cycle can help you plan for or prevent pregnancy based on your goals.

How it's diagnosed

Pregnancy is typically first confirmed with a home urine test that detects human chorionic gonadotropin. Blood tests provide more precise measurements and can detect pregnancy earlier than urine tests, sometimes as soon as 6 to 8 days after ovulation. Your healthcare provider may order quantitative blood tests to measure exact hormone levels and confirm the pregnancy is progressing normally.

Throughout pregnancy, specialized blood tests monitor both maternal health and fetal development. Rite Aid offers add-on pregnancy biomarker testing that measures Alpha Fetoprotein, CA-125, Ceruloplasmin, and Thyroxine Binding Globulin. These markers change during pregnancy and provide valuable information about how your body is adapting. Alpha Fetoprotein levels in maternal blood rise during the second trimester as the fetal liver produces this protein. Ceruloplasmin increases due to higher copper requirements during pregnancy. Thyroxine Binding Globulin rises because estrogen stimulates the liver to produce more of this thyroid hormone carrier. Testing at Quest Diagnostics locations makes prenatal monitoring convenient and accessible.

Treatment options

Prenatal vitamins containing folic acid, iron, and calcium
Regular prenatal care appointments with your healthcare provider
Balanced nutrition with increased calorie intake in second and third trimesters
Gentle to moderate exercise as approved by your doctor
Adequate hydration, typically 8 to 12 cups of water daily
Adequate sleep and rest when needed
Avoiding alcohol, tobacco, and recreational drugs
Limiting caffeine to less than 200 mg per day
Managing nausea with small frequent meals and ginger
Monitoring blood pressure and blood sugar as recommended
Screening tests for gestational diabetes and other conditions
Medications only as prescribed by your healthcare provider

Frequently asked questions

You can take a home pregnancy test on the first day of your missed period for the most accurate results. Blood tests at your doctor's office can detect pregnancy earlier, sometimes 6 to 8 days after ovulation. If you test too early, you may get a false negative even if you are pregnant. Wait a few days and test again if your period does not start.

Prenatal blood tests include initial confirmation of pregnancy, blood type and Rh factor, complete blood count, and screening for infections. Additional tests measure Alpha Fetoprotein to assess fetal development, especially in the second trimester. Tests for Ceruloplasmin and Thyroxine Binding Globulin help monitor how your body adapts to pregnancy. Glucose screening checks for gestational diabetes, typically around 24 to 28 weeks.

Alpha Fetoprotein is produced by the fetal liver and yolk sac during development. Small amounts cross into the mother's bloodstream, causing measurable increases especially during the second trimester. Abnormally high or low levels may indicate certain conditions, so your provider uses this test as a screening tool. This test is part of prenatal screening panels that assess fetal health.

Pregnancy increases production of Thyroxine Binding Globulin due to higher estrogen levels. This protein carries thyroid hormones in the blood, so total thyroid hormone levels appear elevated even when free thyroid hormone remains normal. Your healthcare provider interprets thyroid tests differently during pregnancy to account for these changes. Proper thyroid function is essential for fetal brain development.

First trimester symptoms typically include missed periods, nausea, breast tenderness, and fatigue. Many people experience frequent urination, food aversions, and heightened sensitivity to smells. Mood changes are common due to rapidly shifting hormones. Some people have very mild symptoms, while others experience severe nausea that interferes with daily activities.

Ideally, start taking prenatal vitamins with folic acid before you conceive. Folic acid is most important in the first few weeks of pregnancy when the neural tube forms. If you are already pregnant, start prenatal vitamins as soon as you know. Look for vitamins containing at least 400 to 800 micrograms of folic acid, plus iron and calcium.

Yes, some people have very few or no noticeable symptoms in early pregnancy. This does not mean anything is wrong with the pregnancy. Symptom severity varies greatly based on hormone levels, individual sensitivity, and other factors. If you have concerns about lack of symptoms, talk to your healthcare provider for reassurance.

Avoid raw or undercooked meat, fish, and eggs due to infection risk. Skip unpasteurized dairy products and soft cheeses like brie or feta. Limit high-mercury fish such as shark, swordfish, and king mackerel. Avoid deli meats unless heated until steaming, and skip raw sprouts which can harbor bacteria.

Weight gain recommendations depend on your pre-pregnancy body mass index. People at a healthy weight typically gain 25 to 35 pounds total. Those underweight may need to gain 28 to 40 pounds, while those overweight should aim for 15 to 25 pounds. Your healthcare provider will give you personalized guidance based on your individual health.

Most people can safely exercise during pregnancy with their doctor's approval. Aim for 150 minutes of moderate activity per week, such as walking, swimming, or prenatal yoga. Avoid contact sports, activities with fall risk, and exercises lying flat on your back after the first trimester. Listen to your body and stop if you feel dizzy, short of breath, or experience pain.