I bought all females so I wouldn't be overrun with fry. Guess what? Very surprised 4 months in to find babies. Both girls had two birthings each from retained sperm. Only two fry survived though. One female and one male. I just let them birth in the tank and let nature take its course. I have a decently planted tank. I am down to three fish though so wold welcome a few more.
Yes i have lots of plants in there,shes managed to hide a few times but they end up findong her and now shes just hanging at the top trying to be by the heater(all tje other pregnant mollys hide by the heater too)
When my moliies gave birth they had that too. Every animal that gives birth has to get rid of the afterbirth. Yes Mollies can abort from stress. One of mine gave birth to some barely formed dead ones as well as live ones the last pregnancy. Sometimes it just doesn't make it full term.