Glad you're on the other side of it, Zap! Just as a data point, I had a lingering cough for about 5 days after day 10, but as I understand it you're not contagious by day 10 in mild cases. The only way to know for sure is a rapid antigen test (the one that goes WAY up your nose. It's not necessary to do that per the CDC, but thats how you would know. I tested negative by day 21 from first symptoms via the antigen test.