I have been in your fertilty shoes, and from going through the highs and lows of it, I would strongly suggest doing you embro transfer first, the hormones and pregnancy do take a toll on you and after having the sleeve done myself (15mnth after baby) I cant imagine being pregnant on top of it. If you need to slim down before transfer, try the diet you will be on after surgery, mostly protien and veggies and fruit. Walk or try some yoga (which totally helps during pregnancy.) I wish you the very best of luck.