Implantation

Implantation is the process in which the early embryo attaches to the uterine lining after traveling toward the uterus.

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Quitting smoking before pregnancy

Why quitting before conception matters Smoking affects pregnancy before many people know they are pregnant. In the first weeks after conception, the embryo implants and the placenta begins to form. Cigarette smoke exposure during this period can affect oxygen delivery, vascular function, inflammation, and placental development. Carbon monoxide binds hemoglobin with high affinity, reducing oxygen […]

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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 […]

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Key milestones during each month of pregnancy

How pregnancy months relate to weeks and trimesters Pregnancy is commonly divided into three trimesters: weeks 1 to 12, weeks 13 to 27, and weeks 28 to birth. Month-by-month descriptions are approximate because calendar months do not align perfectly with gestational weeks. Clinically, your care team will usually communicate in weeks and days, such as […]

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Baby development month by month during pregnancy

Understanding pregnancy months and gestational age Pregnancy is usually dated from the first day of the last menstrual period, not from the exact day of conception. Because ovulation and fertilization typically occur about two weeks later in a 28-day cycle, a person who is “6 weeks pregnant” may have an embryo that has been developing […]

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How pregnancy changes month by month

Understanding pregnancy timing: weeks, trimesters, and months Pregnancy is usually dated from the first day of the last menstrual period, even though conception typically occurs about two weeks later in a 28-day cycle. A full-term pregnancy is commonly described as about 40 weeks. Clinicians often use trimesters because they align with major developmental and medical […]

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Pregnancy month-by-month overview

How pregnancy months are counted Pregnancy is medically dated in weeks, not calendar months, because fetal development changes quickly and because months vary in length. A 40-week pregnancy is divided into the first trimester through week 12, the second trimester from weeks 13 to 27, and the third trimester from week 28 until birth. Month-by-month […]

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Month 1 of pregnancy: symptoms, embryo development, and what to expect

How month 1 is counted Pregnancy is usually measured by gestational age, which starts on the first day of the last menstrual period. This convention is useful because the exact day of fertilization is often unknown. In a typical 28-day menstrual cycle, ovulation and conception occur around week 2 of gestational age, although cycle length […]

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First second and third trimester overview and how pregnancy changes across trimesters

How pregnancy is divided into trimesters A full-term pregnancy is often described as lasting about 40 weeks, counted from the first day of the last menstrual period. This dating convention means that the first two weeks of a counted pregnancy usually occur before ovulation and fertilization. Trimester dating can vary slightly by clinic or source, […]

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