Short cycle

Me

After a missed miscarriage at 15 weeks, I’m super eager to get pregnant again and try for my rainbow. Just finished my first AF yesterday and tried my first OPK today and got a positive. My cycle has been short in the past (24 days), so I would start OV this weekend but the day after my period seems soon? Could I get a false positive bc of my mc or AF? Going to BD anyway :)