Weight gain help

Taylor

So this is my second pregnancy, with my daughter I was SMALLLLL.... I gained probably 20 pounds but I didn’t gain but maybe 10 pounds until the last 6 weeks.... well with this one I have gained 7 pounds in 3 weeks. I’m not even 7 weeks yet.... WHAT IS THE DEAL?! I’m not eating anything different, I’m not eating excessive amounts... I had an ultrasound at 4w6d and the doctor said he could potentially see a second sac, but that he couldn’t get it in a stand still picture so we’re not 100% sure if there’s two or not, I go back Tuesday for another ultrasound to confirm one or two babies... my question is... has anyone had this much weight gain so quickly so far?!