3 days late and cramping

In advance thanks for reading I just need to vent I have a 27 day cycle last month I got af on the 16th for y days this month I thought it was suppose to get it the 13th I was moody and everything af didn't come so I checked my glow app and it said that i was due on the 12th woah I have taken 3 hpts all bfn none with am urine the only thing I've noticed is my bobs are a little sore, my nipples are sensitive n now the cramps I had a really bad pain on my left side for a minute or two but nothing compared to the cramps I don't want to think to much on it bcus af has funny ways of kicking you in the gut. thanks again for reading