Pcos, provera, clomid, positive opk

I started provera to get my period as i hwve pcos and have maybe 3 periods a year on my own. I got my period 10/6 started clomid on cd5 10/10 took an opk on 10/12 and had a positive for 2 days. Took last clomid 10/14. Tested for ovulation again today to see and it was negative. My question...is it possible to get a positive opk before your done taking the clomid? Im so confused....im 32 and this is our first cycle ttc for number 1. Im hoping it workes but am very leary as i tested positive so early ....any advice or help is very much needed and appreciated:)