Am I safe for tonight?

Júlia

I lost a pill and didn't find it so I had to do my rest week before (last week) and started a new blister 4 days ago (Monday) as it was indicated in the information on the packet. It said that this way you'd be protected against pregnancy. I'll be having sex tonight and I don't know if the change of 'schedule' has affected the pill effectiveness. Am I still safe for tonight? How much should I wait to have unprotected sex again if not? Thanks!