Is this really Breakthrough bleeding?

it sounds to me that when you missed the pill your body figured it was time to shed the lining of your uterus, i was on the pill for a while and the 2nd day off the pill i starting my period, you body is full of hormones and the missing the pill can play tricks on your cycle.. on the other had if you have been ually active during those times you could be pregnant, I would go to the dr. to know for sure