I don't think people need an easy button in this. If you are a serious breeder or want to do the job right, you will find a way to keep track yourself.

Period.

I don't need the "Too Soon" changed on the HUD, or the website/spreadsheet.

Breeding should take a bit of work. A bit of figuring out how to do it, without a "How to breed" manual from Malevay, or giving the hour and minute until fertility is good for involvement in the process.

Planning, observation and backup plans, they all work just fine.