Pregnant? Or crazy hormones.

So, I started birth control about three months ago now and stopped after 6 weeks as I was getting 'break through bleeding' every day almost with a day or two in between to 3-4 days in between for about 3 weeks. They were never regular period-like bleeding so was that considered my period or not? Because 9 days ago I was supposed to start my period and it hasn't started. Also my boobs are crazy sore which never happens to me when a period is coming or late.