Coco, you need to be far more proactive in your own health. You should never have sex without birth control unless you are trying to get pregnant. There is always a risk.
Also? It is dangerous to leave a condom inside of yourself. If that happens again, please attempt to retrieve it. If you can't, then go to the doctor. There are all types of infections you can get from leaving things inside your body like that.
If you are not pregnant, count your blessing and run to the nearest planned parenthood to get on some birth control. Always make your partner wear condoms. They will help prevent diseases that you cannot see.
Be strong!