already check it, i found the bug and fix it
it supposed cycling the period but i forgot to add case period = 0 or null to initialize the cycle but unfortunately the period state forever in safe day
the pregnancy chance calculated based on item bonus, period phase, and how many sperm inside her, also for multiplets you need to be lucky to hit the chance without item enhancement
and thanks for the support
I've found a way to fix the menstrual cycle bug while we wait for the next update. Basically, you have to go into the debug room and manually start the cycle. This allows it to run properly in the apartment. It also eliminates the ovulation kit bug (the one where the affection is greater than or equal to 1). With these bugs fixed, the pregnancy system is much better than I initially thought, since I was finally able to make Mai have multiples. You're cooking up something good, dev!