Ovulation

Hey ladies, I need help. I have been ovulating on my own I use the clear blue test even tho I was ovulating on my own my dr still prescribed me letrozole just to boot it so hopefully that would help us get pregnant a little bit faster l, well I had surgery back in August so I never went back and got a refill on the letrozole and I haven't been back to the dr since because I have been so busy trying to catch back up at work and everything. Well I started taking the ovulation test again and I keep getting the "high fertility" smiley and I was thinking okay I just came off of some strong medication so I'm sure next month it will get my peak smiley well I was wrong I was still getting "flashing smiley" so I'm thinking okay it's been almost 3 months since my surgery I definitely should see a positive this month. I started taking them last Tuesday which would have been day 9 of my cycle and I got my flashing smiley like I should well I usually get a positive on day 13 and it is now day 15 and all I am still getting is flashing smileys! Has anyone else had this problem or should I be concerned that maybe my surgery messed me up? I know I need to go back to the dr but I'm trying to get some of my hospital Bill's payed off from my surgery and I plan on going as soon as I can.