A couple stayed many years with out conceiving, and the lady does not know that her system was different from other, which she do ovulate while menstrating and fall seek, so her hubby do pity her cos of her illness, but my mentor asked her if her menstration is slippery she said yes, and she was advised to make love during her period which is disgusting to many, that was how she got pregnant. The major thing is to understand you fertile days and peak.

@Glory14257, people ovulating on period is an exception and not a norm. Majority ovulate at about 14days after the start of their period. Thus, if you say male conception is likely on your ovulation day (peak of fertility), then I can agree, and not on the day of your period

There is possibility of pregnancy, cos semen stays in a woman's body 3 day on, so if you start ovulation when sperm is still in the body u will b pregnant, n some people ovulate while menstrating, like when the menstral blood is slippery. So if you understand your system or read about Billings.