No period, yet no line.

Risa • Mommy of Aivah, an angel and a Pit!👶🏽😇🐶 Live near STL!🏡 I'm a cancer!♋
I was supposed to start my period 3wks ago but yet still you see af. I was having dry cramps and all. I decided to takea text and there was nothing. I waited 2 days, did the same, still nothing. I want really worried until last night we we're bd and i started feeling a pain in my lower abdomen on the left side. Anyone know what that could possibly be? Or have experienced something similar?