Weird dull cramping feeling?!

Help! For the last couple of days I've had this weird feeling in my lower abdomen. It feels like really dull period cramps but I'm not bleeding at all. I'm on cd24 and at 13dpo. My cycles are really confusing as I'm not due for af for another 8 days. What could this weird feeling be?

**EDIT** i know that usually being 13dpo would mean a period would be due in the next few days but i have a long luteal phase which my specialist knows about. My ovulation is confirmed by ultrasounds.