I think my guinea pig is pregnant. she's been getting a lot of weight daily and it's very notice. she's 5 and a half months old and I think she is about 2 months pregnant. my younger sisters put my female guinea pig in my male guinea pig in the same cage. she has been very moody. She used to love getting her belly rubbed, but now, if you touch the side of her stomach, she snaps and bites you. Also, she eats twice th amount of food that my male guinea pis eats, and my guinea pig is older. She drinks ALOT of water!!. She went into heat once, but it was really short. Sh was calling my male guinea pig and then my sister left them alone together and after that, she started acting differentdifferent, and she suddently fell out of heat. I think shes pregnant. What do you think?