Do you ovulate around the same time every month

Sophie

So this month it’s CD 9 and I have a positive OPK , my previous cycles I haven’t ovulated until around CD 20 so quite a difference, however last month AF came only 2 weeks after the last one finished and I don’t think I ovulated according to OPKs unless I missed my surge, anyone’s else ovulate and different times ???? Help I’m confused