Any small chance of pregnancy?

let me just start by saying I have NEVER had sex. my boyfriend and I have only done mutual masturbation or similar. anyways on April 21st (about 3 weeks ago) was prom. I had been taking my birth control every day by probably about 1030 am and I usually take it at 7. i take the pill nonstop and have never gone a complete day without taking a pill, at most has been 17 hours. anyways, the week leading up to prom I took my pills in a timely manner from what I remember. then, the day of prom my mind slipped from all the excitement and I took the pill 6 hours late. we went to prom and after he fingered me while I was working on him and there is a chance that cum entered me vagina. we both tried to make sure we were careful but we got caught up in that moment so there is a chance that I got fingered with cum. about a week later we were at his house and we worked on him first, then he pulled up his pants and went to work on fingering me. i tried to make sure hos hands were dried if anything had gotten on them and tried to give it enough time to dry before i got fingered but honestly it might've still gotten in me. since then, i have been having light headaches and I think my nipples have gotten a little bit darker. I may have to pee more? I have also noticed a small pigmented line on my lower belly skin that I have read could be related to pregnancy once again, I have never had intercourse and semen has never been deposited into my vagina from sex. i have also never missed a pill, only taken them late. I have read there is about a 9% failure rate and I would hate to be apart of that 9%. I cannot drive and my mother would never let me buy any tests. any advice?