A–Z Glossary

breast tenderness

Breast soreness, sensitivity, or swelling that can occur when pregnancy hormones increase breast tissue and blood flow.

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Full guide to pregnancy symptoms and how to understand them

Full guide to pregnancy symptoms and how to understand them

Why pregnancy causes such a wide range of symptoms Pregnancy is not a single physiologic event; it is a sequence of rapid adaptations. Rising levels of hCG, progesterone, and estrogen influence the gastrointestinal tract, breasts, kidneys, vascular tone, and the nervous system. Progesterone can slow digestion and contribute to bloating, nausea, and constipation. hCG is […]

How hormones cause pregnancy symptoms

How hormones cause pregnancy symptoms

The hormonal switch that starts pregnancy Hormonal changes in early pregnancy begin soon after implantation. The embryo’s trophoblast tissue produces human chorionic gonadotropin, or hCG, which signals the corpus luteum to keep making progesterone. That early progesterone support stabilizes the uterine lining so the pregnancy can continue. At the same time, estrogen rises, and both […]

First trimester symptoms full guide

First trimester symptoms full guide

What the first trimester includes The first trimester extends from week 1 through the end of week 12. Because pregnancy dating begins with the first day of the last menstrual period, weeks 1 and 2 usually occur before ovulation and conception. Implantation often occurs around week 3 or 4, and many people first suspect pregnancy […]