My boyfriend and I had Unprotective sex on May 26th.. Sunday June 5th, before my period arrived I was having this weird light brownish light red discharge when I wiped after peeing. That same day I had got my period but was very light. The next day, Monday June 6th my period was heavy. Tuesday June7th, my period was very light as if I was spotting. It is now Saturday June 11th and I am having very light red spotting. I know it's not  old blood from my period because it's usually a bit darker. What could this be??