Do mollies keep sperm?

[sushi]

I've only got 1 female molly.
I'm pretty sure she's just had fry, I've got 2 of them. All my platties are still fat, that's why I think it's my molly.

Since I don't have another male, I was wondering if mollies store sperm like other livebearers.
Am I going to be able to get more fry batches without a male present, or is this not possible with mollies?
Is there gestation period 4 weeks like other livebearers?

Also, what colour mollies can you get. My lfs only had the one dalmation and the males were a yellow and orange colour with smidgens of black and dots. I didn't like them so that's why I didn't get one. What other colours/descriptions can you get?
Will a baloon molly breed with a normal molly?

 

[balloonmolly]

Yes they do store the sperm.

 

[fishrock]

i have a black molly and blood red molly(but they actually might have been labeled wrong they look like sailfin). molly cna keep giving birth onther 3 or 4 times after this.