Is the app wrong or is it a late period??

Gigi

So, so far, the app has been spot on when it comes to tracking my period. I got my last period on the 4th of July (which the app said I was going to) I checked the app again and I was suppose to get my period today the 28th. Normally, I would be feeling the symptoms already and would have seen some blood by now (I know my body) but I haven’t. I have been experiencing some little cramps but not much. It comes and goes. It’s not like a period cramp though. My fiancé and I had unprotected sex 2 weeks ago today (pull out). He didn’t come inside of me, BUT as soon as he pulled out he was finishing AND the crazy part is, it literally aimed right on the outside of my vag. Not the top part but the lips area. Sorry, I know. TMI. I know it says I’m suppose to get my period today but I know my body and if I was getting it today, I would be feeling it and would be seeing some blood. Wether it be a lot or a little pink on the tissues. I took a pregnancy test a few days ago and it came back negative, but I know taking a test too early can give you a wrong result sometimes. If I don’t get it today, would that be considered a “missed period” or me being late on my period? Or could the app be just wrong and I should wait a couple of days?