Well, I took Plan B on 2/15 and got my period on 2/21. It ended on 2/24-2/25. Then in March I got another period 34 days later on 3/27, which lasted until 4/1. Then in April I got another on 4/29, which ended on 5/4. And now it's June, and still no period, should I be worried, or is this because of the Plan B. I'm a bit scared that it might've been implantation bleeding. Please help me. :[