My period is late by five days, but it's normally on time. I am sexually active, but we use a condom AND he pulls out, just so we aren't one of those exceptions. He checks for tears or breaks afterward every time and has reported that there was no leakage every single time. We had sex the day before my period was supposed to start. I wasn't worried when it didn't come the next day because I had read that having sex right before could probably disturb your cycle, but only for a couple days. On day two or three is when I started to stress, and I don't stress out, I'm pretty laid back. I've also read that stress can play a major part in delaying your period, but it's been five days. Today and yesterday I was pretty chill about it because, honestly, what are the odds? I use no other form of birth control apart from what's been mentioned. I really just need some guidance and reassurance that I am NOT pregnant. I'm 17, my mother would kill me. I'd go to the gynecologist, but of course she'd be told the results. Please help me, I'm freaking out.

Update: I'd also like to add that I am experiencing the symptoms I get right before my period: acne, sensitivity in my breasts, short temper, and even faint cramps. I spotted a little last month a week after my period but only for two days and very lightly, if that means anything.