How Much Weight Should A Kitten Gain In A Week?

My cat is a longhair and she weighs around 12.5 lbs. She’s been eating fine, but I notice that she doesn’t seem to be gaining weight as I’d like her to. The vet said she looked healthy enough, so was wondering if anyone could give me a rough estimate of how much my cat should weigh in a week? Should I be expecting something different from the vets standard or is it normal for cats not to gain weight as fast as they would at home? Thank you!