help please! confused?!

So I got ewcm on cd 13 and I took a clearblue advance and it was high (flashy smile) then the next day I had sticky cm and high clearblue advance. Last cycle I ovulated on cd 18 even got the peak on the test. Could I have ovulated and missed it ? Or was that ewcm left over sperm the day before? I just don't know have a feeling I either missed it or I'm not gonna O this month.