It sounds like you have taken all the action you can do to make sure you dont havea baby. If it bothers you that much talk to a dr.
You should be OK but monitor your period (if it still occurs on the patch) and if it passes without anything, just take a home pregnancy test. But, the anti-pregnancy hormone still takes a while to leave your body PLUS you took Plan B so you should be OK. Kudos for stepping up and taking the steps NOT to get pregnant!