Af due today!!!! Period pain for 3 days now!!!

Marita
My af is supposed to be today. Ive been gettin period type pain since Thursday. Thursday and friday i was getting it in the evening only. Woke up today the day af is supposed to be here. Still getting period pain but no show yet!! Did a test yesterday but bfn!!!! Anyone ever had this before and went on to get a bfp??