Just to clarify my sources, not start something, My information on females was admittedly wrong (I went back and checked my book) But the book I have- written by a exotic animal vet, and my own exotic animal vet both say that males are only capable of impregnating females at 6-8 weeks. I had to check because just under a year ago we got Seras and three and half weeks later I went looking for a companion for her on who was younger. I found an ad on craigslist for two babies a male and a female whose mother had come from petsmart impregnated. I was super excited until I realized that she was housing them together and after scouring the internet/ my guinea pig book/ and calling my small animal vet the veterinarian consensus was males become viable at 6-8 weeks and the females as early as 3, while the internet was all over the place. I chose to trust my vet and an exotic animal vet who has been in there field for over 35 years.
So again not to start something, but two vets verified this, and when I brought Pip home at 5 1/2 weeks she was not pregnant.