Gave birth two months ago and no period yet

Virginia
I gave birth on March 10 and breast fed for a month. I wasn't producing enough milk for my son so I had to dry up milk. Here it is almost a month after and no period. My boyfriend and I have only protected sex and I'm on birth control now. I do however have been cramping all week. I think my periods coming with a bang...any other moms had my problem?