Has this happened to anyone before or do you know if it's normal. Ok so we have been ttc for over 9 years and this is my first time using OPK (clear blue easy digital) I started using them on 10/22 I got my first smiley face on 10/27 I took another one the next day and it was a blank circle. I took another one today just to see and I got another smiley face. Is that suppose to happen??