I put a 50% deposit down on a dress, and now I’m terrified I made the wrong choice! What do you think?!

My wedding is October 27th....

UPDATE:

Had my first dress fitting today (long story! I was given terrible advice by the dress consultant..... and I’m not even sure they gave me the actual dress I tried on and purchased), and it barely fit and I’ve LOST weight since I bought the dress.... IM DEVASTATED - my wedding is October 27th- what can I do in only 20 days?!!! 😭😭💔