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Of course being healthy is good, regardless of what your goal is, but honestly I don't think it makes a huge difference. If your cycles are regular (no PCOS, super late O, etc), and your thyroid is in check, then I don't think it matters much. Extra weight means extra estrogen (stored in fat), which can cause eggs to be not as "good" according to some.

TTC is such a crazy journey. There are anecdotal stories of all of different kinds, from women who got pregnant who were even more overweight (or didn't know they were pregnant) to those that only get pregnant when they drop the weight. My best friend is pregnant after thinking it would never happen after losing a ton of weight. But she also stopped eating gluten and milk which were causing inflammatory reactions.

Losing weight and getting healthy can't hurt, but neither can BDing as much as possible. I personally know that going out on my walks every day just helps me personally. I feel better and my outlook is better. And that is probably just as helpful as anything else.

Good luck!

I have PCOS. Before my wedding (we started TTC right after) I lost a lot of weight. Before my weight loss I had extremely irregular cycles with no signs of ovulation. I lost 40 pounds and my cycles regulated themselves to 30ish days and I started ovulating. After my weight loss I had no trouble getting pregnant. Because of my PCOS I experienced 2 miscarriages but I was able to get pregnant 3 times in 3 tries. I'm sure that the weight loss was what jumpstarted my ovulation. Losing weight was very difficult because of my PCOS.

Yes. I have PCOS and from Easter to about June I lost 50 pounds. That and metformin and now I'm pregnant.

I don't have personal experience, but I do have friends who had difficulties getting pregnant, who lost 30-50 lbs and who both had success after losing the weight. They had no other health issues (no irregular cycles, PCOS or thyroid issues), it was simply a matter of working out and cleaning up their eating.
If you know you have 40 lbs to lose, then it can't hurt to maybe make some diet changes (since you say you're really active, which is great!) so that you're in the best shape possible to have a successful, healthy pregnancy.

Yes, for me losing about 10 pounds helped me get pregnant both times. Working out here and there didn't help, but once I started a daily routine of working out and eating healthy, it finally worked. Not easy, not fun, it really sucked in fact, but it was the key for me.