Am I just grasping into anything?

So I am 11dpo BBT is still up. Tested yesterday and got a BFN. AF should be here Monday. (AF usually comes whenever she wants so around there). So when I lay down flat I feel a little pull in my lower stomach. It’s feels like it’s puffed out a little and when I press down a little bit (not to much) it feels different then when I do it to the rest of my stomach. I felt random cramping today but went away for the most part and random nausea. I guess I should test again if AF doesn’t come? Just wanted to see if this sounds like anything or if I’m just really trying to look for something.