Ovulation at the end of the cycle?

Sara • Wed, May 31

Ovulation at the end of the cycle? According to the app I was ovulating on 14th day of the cycle but I went to see my ob gyn and she showed my a big, beautiful egg on day 20 meaning I was just about to ovulate.. it definitely wasn't an ovary cyst - the one I had last period - disappeared.. Anyone experienced a similar situation