To TTC or not to TTC

Hi everyone! My husband and I have been trying to conceive for a few months now. (It’s been difficult as I have endometriosis) anyways...tomorrow we’re able to start trying, but here’s the thing...my sisters wedding is August 26th, 2018. If I were to magically get pregnant this month I’d be close to 37weeks the day of her wedding. I had my first 3 days before I hit 38weeks, and my second I was induced the day I hit 37 weeks due to complications.

Is TTC this month selfish? What if I miss her wedding day?

...but what if this is finally the one that works?! Ugh. I don’t know what to do. Both things are very close to my heart.

Any input?