Bleeding on BC pill (supposed to skip periods)

My last period was the week before April 19 and then I started the pill on Sunday the 19. I started bleeding lightly 10 days ago. Not a lot but enough to sit on a pantiliner and it’s mostly when I wipe. Why am I bleeding after being on it 2 months? If this is my body’s attempt to have a period while on the pill, even tho I am using it to skip periods, shouldnt I have bled May 19 as my “first period” date passed??