Anyone experience secondary Infertility ?

Hi, Husband & I tried very hard after 2 miscarriages.  Only later,  I realised I didn't get my ovulation date right.  Try to monitor your cervical mucus.  Women usually ovulate when your cervical mucus are white & wet.  For a 28days cycle,  I 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. Relax & Good luck!