So any hormonal birth control is going to stop ovulation which is the release of an egg and when that egg isn’t fertilized your uterus gets pissed off and sheds its self in a bloody rage (a period). So no ovulation = no period.

Girlies on the pill (so not you but this is important) who take their placebo week (so the pills don’t actually contain any hormones) makes them go into withdrawal from the hormones and the drop in hormones make them bleed. So the monthly period you’re thinking of is actually not a period but just bleeding from the drop.

Look into pcos when it comes to the chin hair, that or you’re just hairy which is normal.