when should i start this

today i am on cd2 and heavy bleeding i will be done with my priod on the 3rd witch will be on cd5,,,,i'm going the 5th to ask and be put on clomid 50mg...when i do go get the meds whent should i start taking it on what day i'm was takeing medformin but stop because it made me feel sick and funny all the time..i whent and got the 20 opk's to help me in this i also am bbt so i'm ready i guess u can say...thanks for your help everyone..