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.
If you have sex without using contraception, you can conceive (get pregnant) at any time during your menstrual cycle, even during, or just after, your period. You can also get pregnant if you have never had a period before, during your first period, or after the first time you have sex. There is no safe time of the month, when you can have sex without contraception and not risk becoming pregnant.