On Wednesday July 22nd, I felt this dull ache on my left side around the pelvic area. It felt like the first day of my period and lasted pretty much all day. It subsided but I still felt a dull ache on Thursday, Friday and Saturday. Worst, it happened right in the middle of my cycle. I've been on the BC pill for 9 months and am what the experts would call "a perfect user". I always take it on time, every night at 9 p.m. and never missed a dose. Could this dull ache around my ovary be ovulation? I'm a little scared it is. Isn't combination birth control suppose to prevent an egg from being released? Now I'm afraid I may get pregnant because me and my boyfriend had sex without a condom on Sunday morning (July 19th). He didn't ejaculate in me but I'm aware his pre-ejaculate could have some sperm in it. I've never felt this before and I'm worried my BC failed.