Yes, though they may not be as noticeable.
Yes, guinea pigs who have not been pregnant can still have teats.
Teats are the equivalent of a human's breasts, babies drink milk from them.
yes and no, a guinea pig can not feed it's babies with two teats, but only if it has more than two babies.
A normal rabbit has eight teats. Even some litters have 12 or more babies. The mother seems to be able to feed them all.
No the guinea pig will no get pregnant.
Only the guinea pig she mated with but be sure to separate them after birth
When I got my guinea pig, we didn't know she was pregnant, so about a month later, my sister got one that wasn't pregnant. It was a little less that a month after that that my guinea pig had 2 babies. During that time, though, Molly, the pregnant guinea pig, was acting very territorial, and Milly, the non pregnant guinea pig, was staying by herself and not having anything to do with Molly. So make sure that if you put a pregnant guinea pig with a non pregnant guinea pig, that the non pregnant guinea pig is a girl, or else there WILL be trouble.
A guinea pig can only get pregnant if a male guinea pig has humped it. A guinea pig may have fallen pregnant while it was in the pet shop or where ever you got it. Now if you think she is pregnant it is important to research breeding guinea pigs.
You shouldn't bathe a guinea pig anyway unless they are absoloutely disgusting. So it would be even more stressful for a pregnant guinea pig. Unless instructed by a vet or she is really dirty, I would say no.
No, only girls get pregnant :)
No, not posible.
The guinea pig will be heavier than usual.