Still no ovulation....

Hello out there. I had a chemical pregnancy in April. Following that I had a completely normal cycle right on schedule as if nothing had happened. This second cycle post-miscarriage however, is not at all on time. I usually get a positive on my opk on day 14-18 but we are now on day 20 with no positive. I’m Wondering if it has anything to do with the miscarriage, but it just seems weird since I had a normal cycle previous to this. Anyone else experienced this?