Last month my period started a bit late(Thursday)....and only lasted 3 days. Then the day after (Sunday) I spotted once, and then again that Wednesday. Its been a few weeks and Tuesday I spotted once, only on the paper. At that point I still had 5 pills left to take before my sugar pills. Now...THURSDAY, I have spotted again. This time in my panties. I still have 3 pills left to take. I have taken a pregnancy test and it says negative. Does anyone know what might be up?

I did miss one pill and took it the following night...and I do have unprotected sex.

 

Thanks.