Losing weight to conceive

I was 170 (5’7) when I conceived the first time and now I’m 20 pounds heavier. I’ve reached my highest weight of 190. I think I’ve just gained a lot of weight from being depressed and lazy after my miscarriage. Just not having much motivation but now I’m trying to get back on track and I’ve started walking and doing some cardio. On a good day I go down to 186 but I constantly fluctuate right back to 190. I’ve really been trying hard to lose these 20 pounds or possibly more. Any advice and did losing weight help you conceive?