Africans were also used in large numbers for slavery because they were easier to buy. During the beginning of the Atlantic Slave Trade, Africans were willing to sell other Africans as slaves to Europeans because they had their own system of slavery.
You could have sex towards the end of your bleeding and then actually conceive 4 or 5 days later with your early ovulation. The probabilities of getting pregnant while on your period are low, but the possibilities are there. This is not the time to have sex if you are trying to get pregnant.
but yes you can get pregnant while on your period whether you have a regular cycle or not its definitely possible to get pregnant if you have sex while on your period since sperm can live in the body for 3 5 days in some cases it can last up to 7 days