First of all, I wish you a speedy recovery.
Just saying, there is absolutely no way you can pinpoint where you contracted Covid. My husband recently got Covid for the very first time. We, along with our adult son, took a 5.5 hour road trip overnight. We stayed in a hotel room, etc. Two days after getting home hubby started feeling crappy, and tested positive the next morning. Son and I never got it, even after 11 hours in the car together and hanging out up until hubby tested. It's a crazy thing.
I would imagine your previous cruise sailed at much less capacity.
13 of us will be on the Allure in August, and the ship appears near capacity. Fingers crossed we will all remain healthy!