Some rast are hard to tell, as some don't show till a few days before birth. You can either take her to a vet, or wait until she gives birth.
A rats gestation (pregnancy) lasts for 3 weeks.
Your rat will start to pile up its bedding around (if you have one) its den, it will become very fat (the last day before birth it will look like its going to explode), and it may start storing lots of food and act aggresive towards other rats. Trust me, I have 2 pet rats and one had 10 babies. If your rat is pregnant good luck, the mother will take care of them, all you need to do is keep mama fed, and read up on what to do, can't explain everythimg in one paragraph!
You will be able to tell closer towards the end of their pregnancy. Weight gain is a major sign. You can try to weigh the rat everyday and see if there is significant weight gain.
A brown rat will be pregnant for around 21 days. A Polynesian rat will be pregnant for 21-24 days.
Not before the rat eats the mouse.
If your rat is nesting and starting to get nipples, she may be pregnant, but it is possible that she is having a 'phantom pregnancy' where a rat show the signs of being pregnant but doesn't give birth to offspring.
Usually when they make a donut shaped nest they are pregnant
A pregnant rat has up to about 20 baby rats.
Rats can get pregnant as young as 5 weeks of age and if they have been in contact with a rat of the opposite sex, they can become pregnant within minutes. A rat's pregnancy lasts for approximately 21 days.
When it looks fat! It might be pregnant or it might have a tumor.. You must put it to the vet incase there are any problems with it.
No. Not the same species.
When it is pregnant or has been desexed.
how i wanna know how to make a rat
I had a pet rat who, when we got her from the pet store, was already pregnant. We didn't know this until we had her for a couple days. She kept kidding bigger and bigger until about a week after we had her, she gave birth. Rats are pregnant for 28 days -occassionally they may have them a day or two early or later. So, if you know about when she got pregnant, it'll be around 28 days later.
I don't really know, I'd ask vet but she could be just be fat like my boy rat, he also stores food and takes it from my other rat.