Inconsistent periods! Hard to predict

Hi girls! New to the app but love it! We've been TTC for about two months now but AF is so irregular for me that it's hard to predict anything. Hoping this app will help! Period is due today May 19th but nothing so far! Tested last week and got a BFN so I don't want to test yet and be disappointed if it's negative. I've been having cramps for almost two weeks now ... Not cramps per say but more so discomfort ? Hard to explain and sore breasts for the past few days! Boosting for a BFP soon!!!