My son is now 2 months old and I have been breast feeding him for most of it. He gets formula maybe once or twice every other day. At 4 weeks I began birth control (pill) and have been taking it every day as prescribed. I was on the pill before pregnancy and would have a period during the last week of the month cycle. Well that week came and gone, but I had no period. Can breast feeding be a reason for this? I've read that breast feeding can cause you to not have a period right away. Any advice? Oh, I am still breast feeding. Not sure if I made it sound like I no longer do it.