A quick review of how pregnancy occurs
To conceive, an ovum (egg) from the woman has to combine with a sperm from the man. An ovum is released from an ovary when a woman ovulates. This usually occurs once a month between 12 and 16 days from the start of your last period if you have a regular monthly cycle of 28-30 days. The ovum travels down a fallopian tube to the middle of the uterus (womb) over 12-24 hours.
If there are sperm in the fallopian tube then one may combine with (fertilise) the ovum to make an embryo. The tiny embryo travels down into the uterus and attaches to the lining of the uterus. The embryo then grows and matures into a baby.
Sperm lie next to the cervix (neck of the uterus) when a man ejaculates ('comes') during sex. The sperm travel up past the cervix to get into the main part of the uterus, and into the fallopian tubes.
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