The Huffington Post mistakenly writes about menstruation and fertility and confuses their readers about getting pregnant.
INCORRECT: "you can get pregnant on your period." CORRECT: You can only get pregnant if and when you ovulate, and ovulation does not happen when you have your period. You can however get pregnant later on (not on your period) if you have unprotected sex on your period. Sperm can survive for up to five days, and if you have unprotected sex on your period, they can survive up to five days and then fertilize an egg later on.
INCORRECT: "You are most fertile before and around ovulation". CORRECT: "Around" implies before, during, and after. You are fertile only before and on the day of ovulation, not after ovulation. Making love after ovulation will not get you pregnant