What will my mouse act lke days before having her babies?

i have 2 female mice and the are both pregnet and got prgnet around the same time, i just seperaed them like a week ago maybe cuz the males started to fight with them, and ive ben waitin and waitin for them to have there babies but its just not happin so is there anythin they will do or a sertin way they will act a day or few days before having there babies and i have been feeding them alot of house hold food like sunflower seeds,cheese slices, bread pizze crust, noodles, cereal that kinda thing is that ok for them i no they need mouse food bt they can live in the wild off garbage so...