What could this be?

Today I am 2DPO. I’m having a pulling sensation in my uterus when I stand from bending over, or sneezing. I believe I ovulated May 13th, it hurt so bad, took my breath away. I had some brown spotting after and the pain lasted for a few hours. I have PCOS and took 50mg of clomid May 3rd-7th. Is this pulling sensation normal? I know it’s way too early for symptoms. These were my OPKs. I wonder if I ovulated way sooner and that could have implantation pain. I had to pant to get through the pain. My second day of clomid I felt the medication working.