What is the percentage of women that get pregnant while on their period?

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I know there is a very low chance of a woman getting pregnant while shes is on her period. (IE Having sex while menstruating) But is there any research done that shows an actual percentage? I’ve looked all over but I can’t find anything.

Actually, it happens now and then, but exact figures are almost impossible to determine. Humans aren’t machines – we all experience variations from what’s considered "normal" at times – and that usually does not cause any sort of problem. That is, until we start to try to come up with percentages…all any competent medical professional can say with certainty is that the risk, though real, is very slight. Still, it’s not a real good idea to forgo protection if you really don’t want to get pregnant! Even the most experienced of obstetricians can mis-calculate dates…
Zero percent chance, actually.
Either the egg would have already left with the menstrual blood and therefore prevent conception, or… the fertilized egg would leave with the menstrual blood soon after, I think.
well my friend actually done it (like two years ago and she never gotten pregnant) and she basically said all that happened to her is she said on her period longer but she used protection
always use protection