Confused?

Well I do know that when I took my opk on the 1/25/14 which was a cycle day 13 it gave me my peak day so I figure that was my day so I bd but the online ovulation calulater told my days were from 1/27/14 thru the 2/2/14 so I didn't do anything on days 29,30,31 so I hope I still have a chance cause now iam spotting darkish brownish for 4 days now it's all this normal my expected period suppose to be 2/14/14 but glow is saying 2/09/14 ever since I put my peak day in the app any advice would be great thanks