Birth Control/ PlanB question

Kaitlyn
Hey everyone! This is first time asking a question and not sure if it belongs under 'birth control' so I'm sorry for the confusion.. I'm 19, and my cycles are not synced at all yet, and my bf and I had a little scare and had to take PlanB... is it going to screw up my cycle even more? Will I miss my cycle all together?? Help!