Will a pregnant woman get pregnant if she and her husband have sexual intercourse during her menstrual cycle?

A pregnant women is already pregnant??

If she is not pregnant then sex can cause it.

I'm thinking this was a typo and you meant to ask "will a woman get pregnant while on her menstrual cycle".

The answer, unlikely.

In order for pregnancy to occur you need to ovulate and have sex during that time.

Ovulation occurs at different times for different women. So the first step to conceiving is finding out when you ovulate.

There are ovulation kits that you can buy that will detect ovulation and give you a better chance of conceiving. There are other methods to determining ovulation, such as checking your discharge, your temperature and other things.

Good luck.

Possible, but as Altenweg said, it is not the most likely time. Always use protection anytime you have sex if you are not wanting to become pregnant to make it even less likely.