Spotting

Maribelle
I was on my period from March 15-18 two days being super heavy and the other being light. I have had light brown spotting since the 18th I have had to use a panty liner and dont have to change it since it is very light, but when I use the restroom and wipe I always have some. Does anyone have an idea of why this could be? It has never happened to me and this would also be rhe second month I am on he pill! I have taken these pill before and it never happened. Any ideas?