If you were prescribed it by your Ob/Dr he/she should of told you this. Some Ob's prescribe you take is days 3-7 of your cycle and some days 5-9. Mine has suggested days 5-9 and its worked for me, 3 bfp's..... Good luck
So, I think the best person to ask is the doctor you are working with that prescribed the medicine. Every woman is a little different. The general time frame that women take clomid is cycle day 3 to 5. (first day of your cycle is the first day of your period, that's cycle day 1). Are you working with a gyn or a fertility specialist?