Feels like AF

Megan
Period cramps at night only... 3 days in a row. No period yet. I had a chemical last month and felt the same way. Tested yesterday but it was negative. Since I was little late last month all my apps same going to start at different times so not really sure when I'll be "late". 
Maybe age is messing with my PMS.. Pre period cramps? Worse in evenings? 
34, TTC #1 11 months