my balloon mollies keep breeding but never get fry.

[kiddomagic]

the title says everything.
I have 6 mollies.
3 female, 3 male.
only one out of the 3 males are the regular mollies.
I see them breeding all the time, but the females never get big or pregnant.
is something wrong, or what?
aren't mollies supposed to be breeding non-stop or something? -____-
my friend had to give me HIS balloon molly fry.

 

[Bschowa]

how long have you had the mollies for IME iv had mollies that only seem to get pregnant once every 90 days. and others that seem to be popping out fry every month. also when you say that you only have one male that is regular is he the one that is having sex with your females?