Hi, just to share my experience. Husband & I tried very hard after 2 miscarriages. Only later, I realised I didn't get my ovulation date right. Maybe you can try to monitor your cervical mucus. For a normal 28days cycle, a woman should ovulate on day 14-15, however my last ovulation happen on day 12-13 when I noticed I was 'wet'. I tested using clearblue OPK & I saw a smiley face & my pregnancy was successful. Don't trust app dates, its not accurate as it doesn't understand our body. Don't stress. Good luck!
Timing