Prego? and another question!

So I bought some mice to breed for my one corn snake and a friends lizards. 1.2 set. First question is they were ordinary run-of-the-mill feeder mice from a reptile store; Will they still breed alright? And Second q is it's been about 8 days since i brought them home and only one female looks pregnant; what are some behaviors that can signal a pregnancy? I think she is fatter and when i got her she would freak out when i went to pick her up, but now she doesn't run away as bad. she seems kind of lazy. And she eats more. The other one is still tiny.
Thanks for any info! :)

There are 2 ways to tell if a mouse has been bred. 1 is to see a sperm plug, which you will only see right after she's been bred. The other is to wait until she is physically showing that she is pregnant, it will look like she has a round belly about 1-2 weeks before she's going to give birth.

They should breed okay, but watch for tumors, since they're from pet store lines. :gj: