can I get pregnant?!

Hi!! Im a 17 girl with a long term boyfriend. I have been asking my mom repeatedly for birth control. She refuses to put me on it until college (1 year). My boyfriend and I have had sex three times but the last time we did my period was late by a week. This week was absolute hell for me and I told him we were not gonna have sex again till I got on birth control. Now seeing that this is not an option I'm wondering how to cope with having sex without it. We are very safe. We use a condom AND pull out. I also religiously track my period and we do not have sex on my fertile days. Is this enough precaution or should I just remain absent. Please be honest, I'm just so nervous to have sex again after my scare. Are there any other things I could be doing to prevent pregnancy. All comments welcome please help.