I’m gonna start off my saying my periods are VERY regular , painful and sickening, but always come on the expected date, and I always feel cramps a few days before. I had (unprotected) intercourse 18 days ago on the day of highest ovulation. 9 days later I got awkward mild cramps but they went away after awhile. Period was expected 4 days ago ( so 14 days after intercourse) but still hasn’t come and usually I cramp badly all the way up until it comes. On Day 16 since intercourse (and 2 days late) I did 3 cheap Pinkdye tests and they all came back Clear Negatives (wasn’t first urine of the day). I’m planning on taking another tommorow but if it’s negative then it’s very confusing as my period has been regular since I was 13, and there had been no change to my lifestyle, stress levels/health,diet or sex life.