I'd let go, they know what they are doing. I've been at this for a long time, you can't trust that heat cycles come at certain times. I was lucky if My one female came in once a year. I have another one that comes in 3-4 times a year, epecially if I haven't bred her that year! Ya just never know. But they know what's going on, so I just let them do what comes naturally!
