Tingles or Pulling sensation before BFP

This will be my 20th month TTC and last month I had an HSG test to check me Fallopian tubes. I was having light periods when ovulating on my right side. This month I finally had substantial EWCM and no I'm due tomorrow for AF and having strange tingles or tickling in my lower stomach. It slightly feels like a pulling in my uterus. I'm testing tomorrow but wondering if anyone else had this?!? Thanks!!