[Maloo]

You neglected to tell us how frequently you're sexually active, so that makes answering this a little bit harder.

But with what you told, it's entirely possible that the pills are screwing with your period. The pill you are taking is specifically made to give you shorter, lighter periods. That can mean that they have the potential of going away completely.

If you live in the US, you can go to a planned parenthood to get a free pregnancy test done.