stressed

Layna
So my period is 8 days late. I've taken two pregnancy test and they have came out negative. Yesterday I've had a little blood come out and even today. I also took a plan   b pill Monday because me and my boyfriend had a condom malfunction Saturday. My period was still late on the day I had sex and when I took the pill. Could i still be pregnant? Or could this just be the plan b pill making me spot?? Pleaseee let me know