Hi. I had protected sex with a condom, unsure if the condom broke I took plan B less than 48 hours later but more than 24 hours due to the store close. I had sex a day after my period ended, the 16th. 5 days later I bled and had cramps similar to a period, but I knew it was not my period because I had it a week before that. I read that was a side effect to plan B. It's been 5 weeks, 3 negative pregnancy tests and I'm unsure if I should be worried or not.  Can anybody shed light on their situation with plan B? 

By the way, I got off of birth control a couple of months ago for other reasons due to my health recommended by a doctor.