Ideas???

I am 5 weeks 3 days pregnant and I play on a coed soccer team with some close friends. Because I am the goalie I need to stop playing now that I am pregnant, but I don’t want to tell people that I am pregnant until I am further along. I need a cover story as to why I can’t play for the rest of the season, and it can’t be a obvious injury bc I see my teammates socially in between games & don’t want to be trying to fake a limp or something! Help please!!