Period missed on birth control. Kinda scared! Need advice!?

So like I've been on birth control since April. Barely missed a day (like once or twice) since I started. On the 13th I fell asleep on the couch studying and missed the time I was supposed to take it (10 pm) and woke up to take it around 2 am or so. So fast forward to five days later and I have sex. It's unprotected but he pulls out (like usual) before finishing. Again, I'm on the pill. Now today I was supposed to have my period. Never came and today's over. I called the nurse in my campus's women health center who deals with birth control. She said I don't have much to worry about since I've been taking it since April and that I'm probably stressing out too much and causing myself to miss a period b/c of stress. But like I called other places, like planned parenthood and other receptionists in my campus to get an informed opinion and they said there is a slight possibility and it's best to get tested. I bought a home pregnancy test and it said negative, but I'm afraid it's too early to tell. I'm just really scared. I thought i was being responsible but even then i screwed it up a bit. I don't know what to do. I'm freaking out ans gonna take a urine test at my campus on tuesday. I'm not ready for a kid. Too young and too ambitious. Also I love my bf and I'm afraid he'll leave me. So like is it possible to be pregnant. My nurse said since I've been on the pill since April I shouldn't worry but other sources tell me there's a possibility.