What's the best way to use clomid?

I've done 2 rounds and af started this morning, so I will be starting my 3rd round on day 3.. I was just wondering if it is better to have sex every day of the fertile window until you ovulate or every other day? Also what vitamins should I take that may help? I have been taking prenatals every day for over 2 years, I just started taking zinc and fish oil.. I am also going to use preseed this month because I tried robitussin last month, but I didn't see a difference at all. thank you in advance ladies!