cramping

Alex
Well I've been having unprotected sex....
So you can say yeah I'm asking to get pregnant .
But I have PCOS I weigh 180 lbs and 5'5 I'm overweight. My periods are irregular and I tried getting pregnant before and I know I can't.
The only difference now is that, I take metaformin for my PCOS. And I've been taking it for a good month. 
Right now I am having extremely painful cramps and I am really tired... but my breast are sometimes tender off and on....
And I'm ovulating this week and I had sex about 4 times this week. And several times before ovulation. 
Today is the peak of my ovulation about 32% 
My period is not due for another two to three weeks. 
I don't want to buy a pregnancy test and it comes out negative. It only makes me cry and feel horrible... I just want to ask you guys to see if any of y'all know if this is normal. I don't wanna give my hopes up. 
I haven't told anybody because I don't want to tell them I think I'm pregnant and Im really not. 
What do y'all think? :(