Clomid.

Okay guys, my doctor is an amazing guy I truly couldn't ask for better. BUT he has kind of left me confused about how I'm suppose to take clomid. He just prescribed it to me and said take them.. I believe I'm suppose to take them then test for ovulation and the BD? But... I have a three day period most of the time. And ive read to start to pills on cycle day 3 or 5 and then test and be when I'm ovulating... Can someone PLEASE explain this better to me. I started AF today. So I need answers quick. And I'm just super confused. I'm going to call my dr Monday and talk to him more unless you guys can help!!