My girlfriend and I had sex last month I used a condom but now she is a week late and I don't know if she is pregnant or not because the same thing happened last year, we didn't have sex and she was a week late? I am wondering if anyone can help me?

If she stressed out she could be late. If she is exercising more she could be late. You will have to wait it out. If you don't want kids at this time. She should get on the pill and for you wear a condom. But I would guess if this happen last year, something is stressing her out.

I got more information both times that she has been late she has been really stressed out. This time I found out that the medicine she is taking because she doesn't have a thyroid; the doctor changed the brand recently, so we think that might be something as well,

Does this sound like it could be a reason?

That is possible but have you tried a pregnancy test? But to me is sounds like stress that have happened me many woman and it is scary to deal with alone so just remember to be there for her...

That's sounds like that could be the problem, but just to be sure, buy a test.