Help me please someone, anyone?

I am spotting. I think I might be pregnant. If I am, the guy I am with is a pothead (and so am I) and we're both trying quit smoking pot and cigs. Plus we take pills occassionally. I am stressing out. I already have a two year old I couldn't raise. I don't want to drop out of high school. I'm not a slut, really. I was drugged wen I got prego the first time. Losing my baby is whats turned me to drugs and I am in a stable relationship or I wouldn't of had sex with him. I have panic disorder. Can anyone please tell me how to not stress so much? I have to wait two weeks to take the test after conception I know. We used a condom and I am allergic to birthcontrol. Please help me stop freaking out.