TMI WHAT IS THIS?

My fiancé and I have been ttc since May. We agreed we would try for a year on our own without stressing over it or seeing a dr. This month we have been having sex every other day and on Monday I noticed I was spotting. It was a very light pink color almost like a white, but it was just noticeable when I wiped. So I felt upset and figured it was the beginning of my period, but it doesn’t look like my regular menstrual blood. The first two days we very lift pink and today its almost all brown. Nothing comes out on the toilet like I said its only when I wipe. Could this be implantation bleeding??