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No one can tell you for sure if you are or arent. Read the Pregnancy Info for teens sticky because ithas great info. The only thing you can do is either take a homepregnancy test or talk to your doctor and get a blood test done to see what those results are.
Even though you are having anal sex you should still make your bf use condoms.

well i jsut recently had a blood test but do they have to test to see if im pregnant to find out or can they jsut tell???

I don't know what kind of blood test they did, or what they did it for, but I think unless they are looking to see if you are pregnant they probably won't know if you are pregnant or not. Same as a home pregnancy test (the kind you pee on) won't tell you if you, say, have marijuana in your system. (I'm not saying YOU have marijuana in your system, but I'm just making an analogy.) If they don't specifically test for pregnancy hormone in your blood, they probably won't know if you're pg or not.

The good news is home pregnancy tests are easy to get, or you can go to Planned Parenthood and I think they give them for free. If you are far enough along to have symptoms, you are likely far enough along for a test to come up + of you are pregnant. (It usually takes about 2 weeks from the time of the sex that led to the pregnancy for a home test to show a positive.) You're probably fine, but take the test and put your mind at ease. the earlier you know, the more options you have.

Whatever the result, try to take this little "scare" as a learning experience. I wish you the very best of luck! :)

BUt chould these jsut be sympoms from my thirod problume?

The only way to know for sure is to talk to your doctor. He/she will be able to tell you if it is because of your thyroid or not.
You should still take a test to see if you are pregnant or not.

It could just be your thyroid but if you are having sex i would go to planned parenthood and get a pregger test!! Like the pp said then you have more options. From now on if you don't want to get preggers i would wear a condom regardless of what type of sex you are having. I had a friend in school who got preggers and she only had ever had anal sex!! Best of luck!!