Plan B and ovulation

So a couple of weeks ago I had unprotected sex so the following day, I took the plan b pill then it happened again but mistake, 2 days later so I took another. I know I wasn't ovulating bc I wasn't supposed to until the following week. So I believe I was ovulating last Thursday according to what I was feeling and my calendar, but I started spotting then it went to bleeding, nothing heavy though. It only lasted 3 days, but still makes me nervous. Anyone else ever had this happen? I figure it's bc of the plan b since it throws everything off but just weird since I was ovulating.