Pregnant, worms or something else?

This is a long story so bare with me. I found an advert for this beautiful little Bengal, it said she was just over a year old, there was a possibility she could be 2-3 weeks pregnant and she was also being attacked by the resident male Bengal. They basically wanted rid of her to the first person who could give £. So I rushed through to collect her to prevent her further being used as a breeding machine. We realised as soon as we walked into the disgusting environment she was in that her stomach was quite distended indicating she may be further along in her pregnancy but the rest of her was VERY skinny and emaciated, we could feel every single bone. She also seems much younger than we were told, maybe approx 6-7 months old and potentially her first season. She has been with us a few days now, she is eating wet and dry kitten food consistently and she’s already gaining a little weight. She’s currently 3.1kg and is being wormed with panacur incase she is pregnant (1 graduation per KG for 3 consecutive days incase she has an infestation) She is inquisitive, playful, vocal, affectionate, no vomiting or diarrhea, no signs of dehydration, she has a great appetite, her coat is in good condition, no visual signs of worms. I am pretty sure I have felt movement and feedback from her abdomen a few times when I put on some gentle pressure. We had her scanned yesterday, there was no evidence of a pregnancy but I don’t that rules it out entirely. Her nipples are large and pink. The lady scanning her mentioned heartworm but we are in the UK? She also mentioned she could be having a phantom pregnancy if she was mated. The vet has said because she is absolutely fine in herself this isn’t an emergency for today and to ring tomorrow for an appointment to have her checked over. I thought I would get some opinions from the vets here, we are so confused. Her distended stomach is what is worrying me but if it’s not worms or pregnancy what could it be? Many thanks  

Hello!  I am also confused because most of the causes of a distended abdomen that I can think of (pregnancy, pyometra, abdominal fluid, enlarged liver / spleen / stomach / cancer / lymph node / constipation) would be visible on ultrasound, although it may depend on the experience or the brief of the ultrasonographer.  For example, I personally can scan for late pregnancy and would do so confidently in a professional capacity, but my ultrasound skills are not necessarily up to picking up a lot of the other things on this list, so if the patient was not pregnant then I may pass the probe onto a more experienced ultrasonographer.   The way to know would be to ask the vet: was this a pregnancy scan alone, or did they perform a full scan of the abdominal organs?   Having ruled pregnancy out, is there anything to be gained from a more detailed scan, or from radiography, or through referral to a specialist?  Is it possible that your cat is simply overweight (eg d/t hypothyroidism)? So much of this is context dependent - please remember that I know very little of the context or the cat.   It's always good to ask vets the following questions: 1) What could it still be?   2) How might you rule those things out?   3) how urgent is it to do so? I hope that this helps.