B.P.
It really depends on the woman and also if you are nursing. I nursed my son (and still do). He is 24 months (I know, kinda old) and I only started to get a period a few months ago. And even that is irregular. My other friend who nursed like me got her period at 4 months. So it really depends on the woman and also what kinda of BC you are on. I am on Camilla.