Had an oh no moment today!!

Pulled my wedding shoes out of the box and put them on to practice walking in them...took two steps and walked right out of them! They are too big! My biggest fear is tripping walking down the aisle as I'm a total klutz and there is no way these shoes are going to work. I purchased them in the summer and maybe my feet were hot and swollen. I kept trying today but they are just too long. My wedding is in March so definitely not hot and sweaty. I was going to wear those shoes all night so I'm pretty disappointed. Back to getting another pair (luckily they weren't expensive!). Anyone else wearing ivory heels? Can I see them?