It depends almost completely on the female. If her follicles have already developed to a good size, you may very well miss the window of opportunity for successful fertilization (either she will slug out, or resorb the follicles before you can introduce the male). If you haven't started to cool her, she likely will not put a lot if energy toward follicular development just yet, but you never know until you feel them (or see them if you have ultrasound). Best of luck with them this season.

-Evan