My last period was June 4th it’s regular every month I should have started July 5 it only lasts 3 days. I have yet to start my period. I am sexually active, when the time passed that I realized my period wasnt coming because I wasn’t even having pms symptoms either. I took 3 test myself all negative. Just this weekend I spotted very light pink and some light brown only for two days it’s the 24th still no period. Only symptoms I have are sore breast somewhat swollen breast a little bit of back ache minor cramps come and go. I’m not under any stress.. not sure what to think.. any feedback would be helpful if anyone has had weird confusing situations like this

Thank you!