Well just wait and see! Another one could surprise us all. But as long as she's sleeping, eating, using the litter box and acting fine overall, I'm sure that she is okay. Don't worry too much about the weights! As long as their bellies are getting round and they're keeping quiet, everything is A- okay!I saw 3 too. My daughter's friends mom works at the vet I take Riley to. She said there was 4 in the image ( we texted her to double check lol) and the possible 5th the vet was talking about was towards the top but because she was full of crap it was hard to determine lol. But they say definitely 4. But like you I see 3 lol.
My scale still isn't here from Amazon! I want to weigh them so bad because one looks small.