The last time I got weighed at the doctor was when I was pregnant. The locum thought I "wasn't gaining enough weight" even though I gained 2 lbs in the first trimester despite all the morning sickness, which was a normal amount to gain according to all the different sources I read. I think doctors are just used to seeing women use pregnancy as a Carte Blanche to stuff their faces, that they expect everyone to have gained 20 pounds in the first 12 weeks.