2nd round of Femara-Help Please!

Been TTC off and on 2 yrs.. I'm on 2nd round of Femara. I'm CD-24, I've been having deep pain in left buttocks, pain in legs, and sore thighs. 4 days until AF. I also noticed clear/milky white discharge for the past week or so. I've taken 2 pregnancy tests one 2days ago and the other one today; both were negative. What does this mean? Any thoughts? PLEASE HELP!!!