What are you using for birth control? There is no excuse for someone your age to be having unprotected sex. If you want to be spontaneous, you can at least carry condoms around with you. I've been having sex for years and years and never got pregnant using a condom, and I get pregnant very easily! If you are using drugs that impair your judgement, you are more likely to make irresponsible decisions. Please get on birth control pills. If you are worried you won't remember to take them, get an IUD. Condoms are still a good idea because you never know when your partner might have Herpes or another STD (most people don't know they have it since often there are no symptoms present). You should get tested for pregnancy for your own peace of mind, and get tested for STD's before you have any more partners.
Hi there and welcome. Could just be abnormalities in your hormones which is not uncommon at your age. However, I'm very concerned about the choices you are making. You are playing with fire. Respect yourself, your body and your life. You are giving yourself away for nothing and it can have life long consequences. You need a std screening and to stop the drugs/alcohol and promiscuity as that could end in disaster. If your period doesn't show up, then you need to take a pregnancy test and I hope and pray for everyone's sake it is negative.
Focus on things that will HELP your life. Work, job training, college. That is what you need to be really working on right now and leave men alone as there seems to be a disconnect regarding this type of risky behavior. The path you are on is extremely self destructive.
My words are only meant to help you and that is my sole intent. I am not judging you! But rather ---- know where you are headed with these choices and it is nowhere I'd wish my worst enemy. Soul search and make some life changes, please!
Hopefully you are not pregnant and it is just some irregular spotting/bleeding which does happen. Time will tell. good luck dear