I am 24 years old had a miscarriage in May took as directed by my ob gyn tree months of birth control and then got off it to try and get pregnant. During the tree months of birth control I had a regular period and the fallowing month after getting off also had a normal one but now I'm going on my third month of not having a period. I'm normally irregular so I didn't think of it being anything but now I'm going on two weeks of nausea no matter if I have ate or not. I've taken two pregnancy tests a week apart and both have been negative. Could I still be pregnant?

You could be. There are some pregnancies that are neigh on impossible to get a positive HPT result from. Have you gone for a blood test from your OB? Might be in order at this point.