Hollo, I had extreme tiredness and nausea for the first 10 or so weeks so I stopped going to the gym completely. I am back now on a special program and doing what I would normally do so it's not too late to go back. Just make sure you don't try to do the same weights you were doing before you had a break! There are also some exercises you won't be able to do eg. shoulders so let the intructor know you arepreg before you start the class.