I started off with OPK Clearblue and got no surges for almost a week that was supposed to be my fertile window so I went out and got the advanced. Took advanced that day and was low also. Next day advanced had blinking smiley which is high fertility. Next day got another   high with advanced OPK , and also took the regular clearblue which only shows your peak, and it was a smiley.  The next day, Advanced still had just a blinking smiley(high fertility) and the regular clearblue went back to low fertility. Now two more days of blinking from the advanced and still haven't gotten a solid "peak" from the advanced. What's going on?!? I'm on cycle day 19