Need some encouragement with successful pregnancy and long irregular cycles?

Ever since going off birth control last March my cycles have been all over the board from 28 days initially to 35-49 days. I had a missed miscarriage in October at 8 weeks and 5 days and am now pregnant again. My doctor said today that there is one study out there that says if you ovulate after day 21, you are at higher risk of having a miscarriage. I guess I’m just so scared I’m just going to have another missed miscarriage. Does anyone have success stories? I ovulated on day 35 on the cycle I got pregnant.