I put on about 10 lbs during the IVF cycles (on the 4th one now). Part of it was from less excercise. It's hard to find the time between all the doctor appointments, acupuncture, etc. And I was told to take the excersice down a notch during a cycle. Part of it was from stress eating, which I know is not good. I'm sure the all the meds have something to do with it too.
But there's nothing like a big bowl of mashed potatoes after a day of being poked and prodded.
I'm trying to be better about low impact excercise (walking uphill) but also not beating myself up too badly about it during this time. I lost the weight after each cycle by excercising more and cutting back on the stress eating.