I had taken plan b one step about 5 day ago (Nov. 9) around 10 am. This morning around the same time (Nov. 14) I felt a sharp cramping pain and saw a bit of spotting. It was light at first but then it got slightly heavier, filling a whole panty liner and looking dark brown with a small hint of red, I think. It's slowly dying down the same day but the cramping is still kinda there and sharp. Is this considered normal after taking the pill?