BFN's HELP PLEASE

Girls I'm TTC and my period is usually on schedule was off schedule in May and I ovulated late in June but had sex the day before ovulation and the day I actually ovulate but still got a BFN. No period still and according to my app I'm 4 days late. I'm so in tune with my body that it's driving me insane. What's going on?? Any advice? I'm becoming some what of a pee on a stick addict lol HELP!!!😅😅😅