Surgery for TTC?

I am currently at least 200 pounds over what I should be. I have been off of birth control for 2 years and have been hardcore TTC for about 9 months (ovulation kits, pre seed, etc.) I have been overweight all of my life and when I was in fourth grade was diagnosed with hypothyroidism and insulin resistance, so I have been taking metformin and synthroid for a long time (I'm 28). Weight loss surgery has been at the back of my mind for a while now. My question is should I get the gastric sleeve and then have to wait TTC for 2 years for a better chance to conceive or keep TTC with the chance of not conceiving due to my weight? The 2 years might kill me because husband and I are really wanting a little one, but would it be the better choice? I would ideally have liked to had kids before I'm 30. Any advice?