Yes she is big already, her belly right now looks like Bella did at 63 days with 3 pups! She has gained 1.4 pounds as of 41 days, all in the belly! I am being extremely careful with TBell as far as jumping and rough housing. This girl thinks she is a mountain goat and will climb and jump heights that my other yorkies wouldn't even attempt. I 'think' she almost realizes that she shouldn't be doing those things now, she has been waiting for me to help her get off and on the bed.
Are you going to get an xray of Bella?? That is a good way to get an estimate of pups. Not always exact however, last litter we got an xray at 57 days, vet said possibly 3 pups, but bones weren't calcified completely, looked like a 45 day xray, and asked about her dates. We had ties from my daughters bday on May 22nd to June 3, not sure when she ovulated. She delivered RIGHT at 63 days from first tie 2 girls one 2 oz tiny and one 4oz. Within days my 2oz baby caught up with her sister in weight and since about 4 days old they have weighed exactly the same. They are both 1 pound 7 ozs at 7 weeks.