Maybe pregnant?

Christina
So we have been trying to get pregnant for a while now. I had a laparoscopic cleaning because of my endometriosis. I ovulated 4 days after my surgery, even though we weren't clears for sex we did it anyway, twice. I was to scared of maybe missing our chance. Conception would have been around Aug. 8th and today is supposed to be my first day of my period. No period. My boobs are killing me and I have a very direct pain right in my uterine area, nothing wide spread like full on period cramps. And a bit of whitish clear discharge for the last 3 days. I have some cheap test strips and they are negative. Any ideas? This would be my second child. If I didn't have tests I would swear I was pregnant just by the way I feel.