Clomid

I feel a bit stupid, but I took Clomid cycle days 5-9 and I'm not sure when I ovulated. It was between cycle days 12-15. Now I'm cycle day 21 and I am supposed to start taking progesterone pills. However, I feel like I'm going to ovulate again. I took an opk test and there was a faint line. I know Clomid can mess with opk results, but I feel ovarian twinges like I get when I ovulate. I have a regular 28 day cycle so I'm really confused! I also noticed that Glow has not been accurate about my fertile window. Anyone else ever run into this problem on Clomid?