My boyfriend and I adopted 2 guinea pigs 23 days ago, both sows. They were in the shelter for 1 month and were already bonded. One of them, Boba, has noticeably been gaining weight and seems to have a tennis ball in her belly. My boyfriend and I don't know if she somehow has gotten pregnant, or is just bloated. She eats regularly, if not more than before, and drinks normally too. She seems more lazy and only lays in her hidey instead of walking around. She also squeals when we try to pick her up, but we don't know if its because of her unknown condition or if she just hates being picked up by us. She wouldn't yelp before at the shelter where we first met her. I just want to know if the timeline is possible for her to be pregnant. Also we noticed every 2 weeks she rumble struts like she's in heat, so maybe that counteracts the theory of her being pregnant? We really have no clue and we would like some advice. Thank you