Timeline from fertilization to implantation

Before day 0: ovulation and the fertile window The fertilization-to-implantation timeline begins before fertilization itself. Ovulation is the release of a mature oocyte from the ovary. After release, the egg is picked up by the fimbriae at the end of the fallopian tube and remains fertilizable for a limited time, often described as roughly 12 […]

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When implantation occurs and timing variability

What implantation is Implantation is the stage when an early embryo, now usually a blastocyst, attaches to and begins to embed into the endometrium, the hormonally prepared lining of the uterus. It is not the same as fertilization. Fertilization occurs when sperm and egg combine, typically in the fallopian tube. Implantation occurs later, after the […]

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Week-by-week pregnancy guide weeks 1 to 6

Understanding pregnancy dating before you start Clinicians usually date pregnancy from the first day of the last menstrual period, often abbreviated LMP. This convention is used because the exact date of ovulation or fertilization is often uncertain, while the LMP is usually easier to recall. It means that during week 1 and much of week […]

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What happens right after conception and early pregnancy overview week 1 to 6

Conception is a sequence, not a single event Right after ovulation, an oocyte, often called an egg, is released from the ovary and enters the fallopian tube. Sperm that have traveled through the cervix and uterus may reach the fallopian tube, where fertilization can occur. Fertilization is the joining of sperm and egg genetic material, […]

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