How often?

Mac • 27 yrs old. Married for 4 years. TTC since marriage for baby #1. Clomid 6 failed rounds. Dx with fibroids 9/2016.
How often do you BD during your fertile week? My doc says every other day should do it. My friend says she does it During her 3 most fertile days!! What should I do? I'm also going to try preseed during this cycle.