I have taken a generic form of plan b before when a condom broke. Condom broke again and this time I got plan b not generic. I took this within 3 hours of finding out condom broke. I noticed I have been having severe lower back pain and cramps. Today is the 6th day after taking plan b and the pain was bad. This was worse than a normal menstrual for me I started bleeding today but it stopped. I'm not sure how to feel about this. Should I be worried and do I need to make an appointment with my obgyn?