24w2d and have onlygained 2lbs passed pre-pregnancy weight

I was originally 129lbs before baby and at my 16 week check up I lost 2lbs and was at 127. Today I had my 24 week checkup and I’m now 131lbs so I’ve gained 4 since my last apt which is good.

But has anyone else not been gaining any weight?? I’m fairly thin, and always have been. Baby is measuring right on track and I rarely don’t feel her move so I know all is well. I was just told by my midwife that they normally would have expected me to gain 10lbs by now 😬