Weeks 1-2

Conception (also called fertilization) usually happens about 2 weeks after the start of your last menstrual period (also called LMP). Conception is when a man’s sperm fertilizes a woman’s egg. Conception happens in one of your fallopian tubes. These are the tubes between your ovaries and your uterus (womb).

You may not know the exact day you get pregnant. This is why health care providers use your LMP to find out how far along you are in pregnancy.