I'd love some advice

Nadya • Son & Daughter
So ever since my "period" which consisted of mostly spotting, I have had nothing but cramping feeling in my lower abs like they are cramps. Took three tests throughout January and all came back negative. 
Just thinking could it be a possibility I'm preg just not far enough to read on a test? Maybe a blood test needed? 
I am seeing a gyno on Thursday (2/4/16) to see if I really do have PCOS