TTC #2

So I have been trying for a couple months this past month I took 7.5mg letrozole and idk if there this possible chance that I’m pregnant cause last time I found out I was pregnant I was supposed to be ovulating. But I’m having really bad cramps and my back hurts like I’m on my period but not and I’m super nauseous like way more than normal this happened to anyone else…? Where you pregnant or just ovulation pain idk I never usually feel like this when ovulating.. Help