Dress fitting question

I have lost about 8 pounds and a few inches since I was measured for the dress. I have my first fitting Thursday. So they will alter and take it in. Suppose I come back in 6 weeks for another fitting and I am a few pounds thinner and the dress is loose again. They will take it in again and I have to pay again.

How close to the wedding is the last fitting? At what point should I stop exercising so that my dress will fit properly and will not have to be taken in again?

If you come back in another six weeks and have lost some more inches, then they will have to take the dress in again. Unless you have a cap on alterations, they will charge you again to take in the dress.
Your fittings have started quite early. I started mine 7 weeks before the wedding, had the final one two weeks before, picked up the dress the week before.

Any way that you can postpone your first fitting until the first week of June ? This will give you some more time to lose inches, but then you should exercise only to maintain, not to lose more.