1 week pregnant

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Baby development

Nothing is growing and developing here yet!

It can be difficult to know exactly when conception takes place, so the beginning of pregnancy is counted from the first day of the last menstrual period - which is about two weeks before a conception even takes place. After menstruation, the production of hormone in the pituitary gland increases. The hormone affects the ovaries and causes an egg to mature inside a bladder in the ovary. In the egg bladder, the hormone estrogen is formed. When the bladder ruptures, the egg loosens and the egg bladder is transformed into a so-called corpus luteum. The corpus luteum produces corpus luteum hormone, or progesterone, an important hormone that causes the lining of the uterus to grow and get ready to receive a fertilized egg.

In the case of assisted reproduction (IVF), the first week of pregnancy is counted a little different because there is no menstruation to start from. Instead, the weeks of pregnancy are calculated based on when the egg was picked for fertilization. Egg retrieval is then counted as week 2 + 0 in pregnancy.

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