Dude 45 days...don't worry much. Some people can have it stay in their systems up to 12 weeks, but thats rare.

If you aren't over-weight, have a fast, or decent metabolism, and are pretty healthy you should be clean.

If I were you, and thats worried, I'd go ahead and buy a home-test. I'm sure you'd pass, but that would help you with the paranoia.