opk after miscarriage

Erin
Good afternoon ladies,
I had an early miscarriage last cycle and we are emotionally ready to try again however I'm not too sure how it works after a miscarriage as in will my ovulation be a bit out of whack I usually ovulate on day 16 however I just took this opk today and it is Day 21 for me..  it is a clear blue digital ovulation kit and the results showed a smiley face and when I pressed eject these are the two lines that were there..  Any help or suggestions  would be great!