Well, I am one of those women who believe that your body gains how much it needs to in order to support the pregnancy, as long as you eat healthy and remember that you're not eating for 2 full-size adults. Just you and maybe 1/3 of a person.
With my first, I ate everything under the sun, and I ballooned up, too. I put on, I think about 80 pounds. Okay, so that was too much. However, I was able to lose all but about 10 of it within a year of having her. Over time, I put a little weight back on, and with the next 2, I gained between 40-50 pounds each. On my 4th, I gained about 50 pounds. She was the one I ate the healthiest with. And because I was pregnant (big pregnant) in the summer, I didn't have as big of an appetite. So, if anything, I was definitely watching what I was eating, but the weight still came. By December-January, I had lost all the baby weight and another 15.
Breastfeeding is a HUGE help. Of course, with all my girls and working full-time, I do ALOT of running around, too. However, I have still been eating normally, not really TRYING to lose weight. Like you, though, I was thrilled to be down in weight since my doctor has been on me to lose some of the weight, and nothing else had been working. So, I also am a little nervous about plumping up and not being able to lose it. However, after 4 pregnancies, I also know that a normal delivery weight for me is between 210 and 220.
Gaining weight is part of the package deal, but if you're eating healthy, then sometimes there is nothing you can do. And by the way, NONE of my doctors/midwives have EVER said a word about the amount of weight that I have gained. I have had friends whose doctors have, but I guess I have been fortunate. Like I said, nothing I could really do about it.