okay, so I took plan b one step on the 3rd of December I'm on birth control ,but I had missed two pill previously before that and then started my period. So I went and got plan b. Then I had unprotected sex on the 8th of December because I was on antibiotics and wasn't thinking and got scared and went and got plan b again. Now it's the 27th and I've had some dark brown and red spotting/discharge. I took a pregnancy test on the 26th and it came back negative I was supposed to get my period on the 23rd i red that this is just a side effect of plan b. I'm just not sure tho. Can anyone shed some light on this?