PREGNANCY?

Hard to say, and it's too soon for a test.

If you like, buy a pregnancy test (a home kit) and follow its instructions to the letter. Usually that means waiting for 2 weeks after an expected period, so you may need to contact your physician and ask what the heck that means in your case. A home test is probably moot but if it'll give you peace of mind, they are cheap and easy to use.

I would also take that opportunity to ask about birth control and safer sex practices. Even if you don't get a period, you can still get an STD. Please take care of your health in this as in all areas.