Breast feeding and periods....

Ashley

I just had my baby 3 months ago. I started birth control 7 weeks after giving birth and had no sexy time before that and then let the birth control be in my system for 2 weeks before we did it and using a 2nd form of protection. I had my period the week I started the birth control and havnt since I am a week late.. so I'm confused. Should I expect an irregular period since I nursing or should I take another lovely test.