My app is off since my MC

Kristin • Married 2014👰🏼 miscarriage October 2014🌈baby boy December 2015💙 #2 due July 2020💕💙
So I had a MC in October and didn't have a period for 7weeks so my app thinks my cycle is 50+days. This is my first normal cycle. I got +opk yesterday(cd15) and it had not adjusted anything... Is there a way to fix this?!