So about three weeks ago my girlfriend and I had a sexual mishap. After intercourse, my girlfriend pulled away as to get me out from inside. When doing this, the condom came off. The contents spilled and the condom itself was still hanging from her vagina. (quite comical in retrospect.) We immediately went out and got Plan B One Step. This all happened about 3 days after her period. She showed no signs of taking the Plan B. Today, roughly 3 weeks after taking Plan B, we thought she got her period. Turns out it was only spotting. A brownish and pink color. Her period should be in about 11 days. Is this brown/pink discharge a late side effect from the pill? Or is this implantation bleeding? God help us if it is. Thank in advance.