Period late but test coming out negative?

Jennifer

So, my husband and I recently started trying for a baby… I was using this app and a couple of other apps to try to figure out my ovulation based off my logged periods for the last couple of months. My cycle varies between 28 and 34 days, but never have I completely missed one. I did take several ovulation tests during the time that the apps had estimated… however, I never got that real dark purple line that would indicate I was ovulating, but I did notice a slight darker difference from day to day. We had unprotected sex 2 times in my estimated fertile window.

So fast forward to today, I am on day 39 of my supposed cycle and still haven’t had my period, and I’ve taken about 3 pregnancy tests within a couple days of each other beginning the day of my missed/estimated period and all been negative. Now since I’m not regular on periods, it’s hard to now exactly when a missed period occurs but I’m on day 39 according to this app. My last period began on June 19th. I know other factors can cause missed periods, but I’m not stressed, my diet has changed and my weight hasn’t changed either. Is it possible that I’m testing too early and not enough hcg has developed or is it more likely that I’m not legit not pregnant? I do get random tinges of pains and cramps down there, and sometimes they do feel like menstrual cramps so I’m prepared for my period to come, but it just hasn’t yet….