I need encouragement...

AF is 3 days late. I’m NEVER late with my period. Every tests I’ve taken is all negatives. At home pregnancy test from amazon and FRER rapid response tests is negative. 15 dpo. I need encouragement...if she doesn’t show by tomorrow when I get off work I’m going to the doctor but I just don’t know... if I am pregnant... I’ll be 4 weeks tomorrow. I’ve had mild cramping for two and half weeks. My nipples are sensitive and now my breasts are starting to hurt. I get nauseous every so often.. and I’m just soooo confused...