Antibiotics and cm

Has anyone ever had alot of EWCM for several days while taking an antibiotic? Here's why I'm asking. I have been ttc for 4 years and trying to go more natural this time around. I have regular 28 day cycles and started using opk on cd 11 and I ran out on cd 17 (2 days ago) and never got a positive. However, I have been battling a sinus infection and have been taking Amox/Clav (antibiotic) for 6 days now. My last 3 cycle days I have had alot of EWCM and I have never gotten this amount before and it's very stretchy (tmi). Could this be the antibiotic causing all the cm or am I really ovulating?