Pregnant?

Okay, so here is the deal. I am on the pill but I have missed one or two and also been late taking it. Yes it is stupid, but it is my mistake. Anyways, I had a "period" recently. But I think it was possibly heavier implantation bleeding. I always wear a tampon so I can't tell how heavy it was but it was the lightest period I've had in a while. I always have very heavy periods. It was done in three days. Usually lasts five. Help? Thank you in advance!