Apple Watch series 10, 46mm ok but strap to big!

I brought an apple watch 10, paired it went for a walk with it on, and realised the strap (s/m) is way to big, can I return it? No other strap available in size small? Mortified! My old one fitted but did have a small screen. Cant believe theres no size small straps? Total waste of money if I cant return???