Im scared that I might be pregnant

Ok so my boyfriend and I have been dating for over a year and we have been sexually active for 6 months. We normally use condoms but lately we have gotten a bit to comfortable. Sometimes we have sex for a minute or so and then he puts on a condom before he finishes. We have been doing that a lot lately. I told my friend about it and she told me that im fucked and could definitly be pregnant. She even made jokes about a baby shower. I am really scared now. I am still in highschool and about to graduate in about a month. I tryed to talk to my dad about getting me on birth control but he wont put me on it and im afraid to even mention it again. I cant get it myself because I dont have my own health insurance to cover it. I really need to get on it though. I have not gotten my period yet but im not supposed to get it for a few more days. If im late Im going to be really scared.