Something I have learned about nice suits over the years, is that unless you're willing to ensure the entire suit is fitted, don't bother fixing 1 small thing. If you have a nicely fitted jacket and the pants are all saggy, you'll look just as "off" as if you had just a standard cut jacket on, and also the other way around.
If you don't have time to get your Jacket fitted, get those pants hemmed, and carry your jacket in.
Also my old boss used to cut our ties off with a pair of scissors if it wasn't tied properly, and if it wasn't tight, or wasn't "top button". As for your suit, if you don't care THAT much, it's not perfect but looks just fine. Go have an amazing time man!