Did Gymnastics cause my miscarriage?

My OB said to continue doing gymnastics even though I was pregnant. she said it will help keep my sugar level at normal (I have a history of gestational diabetes) I explained that it was only once a week which might be not good for the baby because it's not something I do everyday and that my body is not very used to. she still siad it was OK. I refrained from high impact stuff, but I did flips on the crash mat (soft foam) and I did do a pull-over on the bar could that have caused the miscarriage? also I jumpeed on the pogo-stick whenever I ate too much sugar.