question please

Tam
I am a 28day cycle when I ovulate most about day 14 but I took a OPK on the 20th of march and got a positive I had unprotected on the 18-19-20-21-23-25 what day did I ovulate on day 20th or 21st or the 22nd which is 14days after I started my period which was the 9th till the 13th but I had raw Eggwhite on the 24th so how may DPO am I I'm going by 7DPO is that right