Putting swaying/TTC on hold, what can I do now?

I have a 1.5yr old little boy and we were planning to TTC sometime this coming spring or summer but now my sister has gotten engaged, asked me to be in her wedding, and chose her date for the very end of October 2017.

I don't want to be heavily pregnant in her wedding and want to be able to have a good time at her wedding so we have decided to put TTC on hold until after she gets married. :(

I've read on this site that the "best time" to TTC a girl is March-May so I'm thinking maybe now we will wait to TTC until the winter/spring time in 2018.

What I'm wondering is if it will mess up my girl sway if I lose weight/start exercising too far in advance of TTC. I would like to get in shape and maybe lose just a few pounds to improve my health and my self-confidence, but I don't know if excersizing/losing weight now versus closer to conception will hurt my chances of getting a little girl.
I'm also wondering if there is anything that I can start now or soon that will help my chances of TTC a girl when we are ready to try. We're only planning to have a total of 2 kiddos so I just want to have the best chances possible of getting the daughter my heart is longing for. TIA

We originally wondered if dieting/losing weight too soon could have some effect, but that has not proven to be the case.

What I'd have you do now is go vegetarian.

Unless you are super motivated to wait, I'd just plan to start TTC after the wedding. The March-May idea is just one little thing and in NO NO NO way any kind of guarantee. Great if it works out, but not a dealbreaker if it doesn't. I got my girl in November and 2 boys in March!! Swaying outweighs the months by a country mile. :)

Yeah we don't particularly "want" to wait until March/May but I guess I just felt like it was important to try to aim for the "girl months" (march-may) to conceive lol, I think I'm just over thinking it a bit but I just want to give it our best shot possible

I'm going to work on consistently doing some light exercise and switching over to a vegetarian diet for now then so that way it's easier to do the 1hour of cardio when we get closer to TTC, I was just paranoid that making changes too soon would sabotage my sway but I'm glad to hear that isnt the case.

Thank you very much for your reply and for the advice Atomic! :)

It's not, though. It's just a small statistical variation of a couple % points. If it works out, great, if not, swaying completely outweighs it.