Freeking myself out or is it reasonable??

Ok so I had unprotected sex on a high risk fertile day.. The following day I went and got a plan b.. I then had unprotected sex again that night a took the plan b the morning after right when I woke up? It says it can mess with cycles and what not but my period is always, always, always on time.. I have two children one is 3 and the other 9 months old. It's been two weeks since I took it and now my period is 3 days late. Am I pregnant??