I went in today at 15 weeks 2 days.
That's great news! My OB does the anatomy scan anywhere from 18-22 weeks depending on your appt schedule. Mine is scheduled for 18 wks 1 day and I had my 2 yr old's scan at 18 wks as well. My last pg, I gained 2 lbs in the first 26 wks and ended up gaining about 35 altogether- you'll be fine in the end. Don't stress about weight gain.
4 pounds is amazing! I'll bet I've gained 4 pounds just this week. I've gone crazy on the pistachios, and we shouldn't even discuss the Gelatto I picked up this weekend. I normally don't do too many sweets, but this spoke to me and I've eaten half of it by myself. Nothing but healthy food for me for the rest of the week.
Yay for more ultrasounds on the way! w00t!