What stops women from becoming pregnant while they’re already pregnant?

Question

Is there a mechanism in the body that stops this, or is it that the sperm can’t get to an egg anymore?

In: 33

Answer 1

There’s no egg anymore. The body stops ovulating each month.

Before the woman becomes pregnant, each month she would ovulate then have her period (shed the unused egg along with other tissue). When she’s ovulating, an egg is released to the Fallopian tube that’s ready to receive sperm – if it successfully does so, the egg becomes a zygote and the woman becomes pregnant. She then stops having her period (because otherwise she’d shed the fertilized egg) and stops ovulating.