Who knew, you can excericse too much!

I have been having a hey day with this diabetes diet. I am eating for the most part everything I am supposed to, my sugars are pretty good most of the time and I have been exericizing. I have lost ten pounds since the beginning of my pregnancy. My diatition and ob are thrilled, my husband isn't unhappy either. I was doing the treadmill and walking on Saturday and lo and behold it was too much. I had to lay in bed most of the rest of the day and it didn't feel very good at all. My belly and back were aching. So I guess i have to settle down and remember I am trying to keep my blood sugars down and not diet.