She got birth control right before we started dating why would she get that if she with just me?

She doesn't want to get pregnant. You can get her pregnant. Therefore, she doesn't want you to get her pregnant. Do you want a child? Will you pay for a child if she has one? Think about that. Sounds like you are thinking in a paranoid way when she is just trying to be responsible.

You're shooting blanks?

Maybe she doesn't want to get pregnant or she has a heavy period.

Oh my friend, you think she is cheating on you just because she is on the pill? You must be good looking because the pill has other uses other than preventing pregnancies. Just read up on it.

http://youngwomenshealth.org/2011/10/18/medical-us...

http://www.teenvogue.com/story/beneficial-side-eff...

She may not want kids right yet