Scared?

Sarah
Okay hey,
so I'm kinda scared I might be pregnant even though I'm only showing two symptoms. Actually nothing could have happened because me and my friend with benefits always used condoms but still I'm a little scared. I never tracked my period and due to  me getting my period irregularly I don't know when I'm supposed to have them again. So me being or not being late on my period is the first "symptom". The second one is that I'm like really hungry 24/7, which actually is a sign for me getting my period but it's been like that for almost two weeks now I guess. Next week I'll be having a doctors appointment because I want to take the pill. It's just safer. Now I'm pretty scared she'll do a check-up (which is what they always do before handing out the pill receipt) and maybe tell me I'm pregnant. I don't know how gynecologists do pregnancy tests or how they can see if someone's pregnant? I mean if I was I would only be in a few weeks
Plus I think I got my period like two or three (I never keep track and easily forget) weeks ago but it was like just a little bit for a few days which is actually normal for my body. One month I'm bleeding like hell and the other month I'm bleeding very lightly and its most likely not really blood like. Idk now I'm a little scared and can't wait to get my period. 
I'm only 18, I could not raise a child. Plus I've been drinking a whole lot the last few weeks. So that's why I'm scared even more, if I'd be pregnant I would've been pregnant drinking all the time. 
I haven't told mf fwb about this because I can't know for sure and I'm too scared to take a pregnancy test and also I'm really broke.