Scared

I'm 15 (almost 16) and have been going through puberty since I was 12. I've had a boyfriend for a year and four days ago we had sex for the first time. Only a small part of his penis went in, and nothing else happened. I've been on the pill for two months, but the day I had 'sex' was the second day I was supposed to take the pill again after my break week. I take my pill before going to sleep, so the day I had sex I had only just taken one pill. I read a day ago that if you're on the pill, you still need to use another form of contraception during the first 5 days. I also read that you might lose some bright red blood after 6-12 days because the embryo is implanting. I just noticed (it's now 4 days after having sex) that I've lost a little bit of blood, but it doesn't seem bright red to me (I can't see it well because I'm wearing red underwear -_-). I'm really scared now that I might be pregnant. I haven't had any other symptoms yet. I'm not sure if I'm pregnant, but I read that if you're under 16, you need parental consent to have an abortion (does this also apply to the abortion pill?), but my parents absolutely must not find out because they're quite old-fashioned and would constantly check on me, and probably wouldn't let me be alone with my boyfriend anymore. I'm really scared now and don't know what to do. I want to get a pregnancy test the day after tomorrow (it's Sunday tomorrow, so the shops are closed). But I'm scared of the result; if I am pregnant, what should I do?
Love, a scared girl