I agree with coffeeat that there doesn’t seem to be a choice between these schools yet.
Amherst and Bowdoin can’t/wont do formal pre-reads with admissions until July 1. Assuming they are positive, the coach will then choose who will get their full support at some point, likely in July or August.
Have these coaches told you where you are on their list of recruits? Do you have a verbal offer from Wellesley? I would continue communicating with the coaches and see what happens/how things play out. Even if all three were to offer you a slot, the timing might not line up. Good luck.