im so upset

I went to the doctors Monday first day of my period. All he said was take Clomid 50 mg days. 5-9 then BP 10-15 I think I messed it up!!! I'm crying my eyes out right now cuz I start ovulating the 9th.. what the hell!! Did he mean CD 5-9??? I'm feeling so lost right now..why didn't he said cd5-9