Clomid first month help

Donna

Im looking for help.

I started my period 12/13 early (7-8am) and had a full flow by that evening. This is my first month taking clomid. I am wondering would the 13th be the first day of my period? Im suppose to take 50mg days 3-7 so im confused if i should start it tomorrow or friday? If anyone could help me id so greatful. Thanks in advance.