What's happening?

Rebecca
Help please! Stopped BC over a month and a half ago, had my first AF super heavy and came 2 weeks late ended on 8/29. First time TTC on the 9/6 and since then (last 4 days and counting) I've had cramping, neausea, gassy, one day of tender breast. What could be happening? The app says I'm supposed to be ovulating but the ovulation tests the past 2 days are negative.