Super Confused!! Help!!

Britney • Isaiah William 9/9/15! ♡♡
So I have been using the opks since the 4th.. BD on the 5th.. and today I believe I got a positive on the opk... but when I put it in my log, my fertile window moved and AF is to show on the 22nd rather then the 27th. Is this right? I have a 30 day cycle and I'm on CD 11