Clomid HELP

Savanah
Okay so my period started Wednesday around 2pm. Well my doctor called me today and said to start my clomid tomorrow which would be CD 4, right? Last cycle I did CD 3-7 with 100 mg of clomid. I'm considering today to be CD 3 and my period is acting like it CD3 also. So what should I do? Take it today or tomorrow?