Chart changed lost now

So my period has been a little off for the past two months so I started using this app I got my period October 18 and it was pretty normal 4 days and then the following month I got my period November 11 and that was 3 days so on this app it estimated my period to come on December 8th I don't feel any symptoms of my period coming but like a week ago for two days I had pelvic pain nothing to bad but I noticed on my right lower stomach each time it didn't last long probably 5min tops so back to my chart me and my husband have been trying to get pregnant with our rainbow baby but recently I decided to take a break since I'm starting a new job with my chart changing kinda changed things because we BD the during fertile week the night of my highest day what should I do is it to early to test? I took a test last month and it was negative