Hey revocalypse!
At the moment, it is unknown how many endings there will be, but as you've mentioned, it would be highly recommended that you save at those decisions to reload at a later time. You should be able to rollback but if you've progressed passed it, you may not be able to and unfortunately, will have to create a new save.
In regards to pregnancy content, we have no plans to add it.
Appreciate the kind words and for taking the time to play AHITR! Glad to hear you've enjoyed your time with it o/