Maternity Swimsuit?

Has anyone ordered a maternity swimsuit? Especially from Motherhood Maternity? I am a small, but have huge boobs. My husband and I are going on a small vacation and I thought it would be good to get a swimsuit in case I am tired alot/we could get use out of the hotel swimming pool. Has anyone had trouble with them? Mine won't come until a few days before we leave, and I will be left without one if it doesn't fit right...I am over 20 weeks pregnant and cannot squeeze in my regular one anymore...not by a long shot!