What is it that I am going through?

I’ve never been through this before so I am hoping one of you may have an idea. My last period started June 29 and it ended July 3. I had sex on July 6 but took Plan B the night after because for sure he finished inside of me. I don’t mind getting pregnant at all right now but I took plan B because I had it and well just to be safer. After taking the plan B, I’ve noticed that I’ve been extremely bloated, and yesterday July 13, i began to spot light blood. This morning I woke up to heavier blood but it was reddish clear. Not the usual period blood. My next period is not until two weeks from now! What could it be? Should I worry?