As you guys know, I started my breeding project about a week ago. I recorded the females weight on April 2nd, and again now on April 6th. Here are the weights.

April 2nd
Female #1- 33 grams
Female #2- 26 grams
Female #3- 23 grams
Female #4- 15 grams
Female #5- 28 grams
Female #6- 20 grams

April 6th
Female #1- 36 grams (+3)
Female #2- 30 grams (+4)
Female #3- 27 grams (+4)
Female #4- 16 grams (+1)
Female #5- 33 grams (+5)
Female #6- 23 grams (+3)

Are these females pregnant? A few of them look pretty larger, but dont have that "ping pong ball" looking belly. Would a ping pong ball looking belly show up within 3-4 days of pregnancy or is this weight gain proof of pregnancy?

Also, in my feeder tank, I have a pregnant female that is clearly pregnant.... She looks like she has a big golf ball as a belly. Should I remove her from the tank and give her her own space or leave her with the other feeder mice? I was going to feed her to my BP but she is clearly pregnant.