I need your opinion and experience

Little

I was checking the folicules size, and on day 13 it was only 7mm. The doctor said it's should have been about 17mm by now.

Based on the bbt charts, CM, cervix positions - I have ovulations.

I've checked hormones, everything is preety well.

I've had one normal pregnancy 6 years ago and a miscarriage in June.

Is it possible that doctor was wrong? It's not first time he made a mistake.