Newbie looking for advice

I am in my early 30s and we are ttc #1. This is our second month and I tracked everything I could (except temp and cervix) so I made sure we hit the peak days. I am 6 dpo (if that's right, I counted six days past the peak day the app gave me) and I'm feeling a little crampy. It doesn't feel like period cramps AND Aunt Flo isn't supposed to read her ugly head for another 10 days. It just seems odd? Any ideas/thoughts ladies?