under weight for 24 weeks?

Emily
I'm a little confused on how to go by my weight to know if I'm gaining enough or not. Pre pregnancy I weighed 140lbs. I was very nauseous but not vomiting but did loose 6lbs by my 10 week appt. I will be 24 weeks in 2 days and I weigh 144lbs. Do I go by the 134lb or 140lb pre pregnancy? I did a calculator for pregnancy weight gain and if I go by 134 then I'm average weight but if I go by 140 then I'm under weight. Just curious on my weight gain. Thanks!