Ovulation

Can having surgery affect my ovulation?? I think it can but this app is usually right or 1-2 days off. But I had my surgery on 3/19 and was supposed to ovulate on 3/27 . I keep getting low or the lines do not get darker . Should I call my OBGYN an ask her about this. I don’t want to keep using my clearblue advance ones since they are  expensive but easy to read. I’m worried I’m not going to ovulate or it’s just being pushed back and if I stop testing I may ovulate. Also my surgery was a  laparoscopic gallbladder removed. So it wasn’t bad.