When did I possibly ovulated?

nina

I have been trying to pin point my ovulation day (aware isn’t exact science)

I had my positive LH on 11/02 and my period started 28/02 (would have had preferred bfp instead)

So when do you reckon I could possibly have ovulated?

I feel like the OPK might have caught the surge too late I don’t know really... I started testing 2x a day since CD8