I have always Od around CD15 and had extrememly regular cycles, with this bub we were gender swaying so stopped dtd on cd13 hoping the swimmers would be ready to catch the egg on cd15 as per usual, I used OPKs to track things and it turns out I didn't O until CD19, somehow, after 6 days, there was still sperm in there and we conceived the gender we wanted but it's the first time I've every Od so late