I own another interrogate around mice?

Hi, it's me again, the one with the pregnant mouse :) For those who don't know, I bought two female mice a few days ago and we've noticed one of them have started twitching and jumping violently every now and again. Is this common? Is there something wrong with her? Is there anything I can do to lend a hand?

Thanks in advance to all who answer :)
HELP.my rat is dying?
Answers:    I would evacuate it i guess it just does that but if you notice it get a lot worse bring it to the vet asap but right now it seems fine
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