I'm pretty sure I just bombed an interview lol

Just had an interview with a big pharma in my area. This was the third round and it was a panel interview, with four interviewers. I prepared for a technical interview, but this stage focused in behavioral questions which completely caught me off guard. I had to use the STAR method to answer these questions and the situations I came up with where so... bleh. In one of the questions I had to change the situation because I didn't know where I was going with it. It was a mess. You had to be there.