Could someone help~ wen should i ovulate?

ok im on my 2nd round of Clomid. the 1st round was feb. 9-13. my cycles are 30days long. last month i used OPK's and i got (+) 21-24. i Bd on feb. 21,22,25. wen should i ovulate this month? the first day of my cycle was 3/9/10. also i want to try preseed this cycle. wat days should i BD. P.S WAT DOES (dh)MEAN? THX