What do you consider your first period after Birth Control?

I stopped Birth Control(Pill) last month and got my period a few days later. On Birth Control I had a 25-26 day cycle and without BC my cycle was 35 days. I'm CD33 right now and no period. I've had sex for two weeks after my period(every second day) I have sore boobs,cramps since last week and nothing! I was only on for a short while so I don't think it could affect me that much.