20 days late!

Help I’m 20 days late with 3 negative pregnancy tests. At this point I would be between 5-7 weeks pregnant. My boyfriend and I haven’t even had sex, just fooled around and the only chance of pregnancy would be him putting his tip on my vaginal opening. I have absolutely no symptoms except being irritable and emotional. My period has never been later than 14 days and i’ve been so stressed about this. What do you girls think??