Is it my birth control???

So I got started on the pill in September 2018 and everything was fine, I was taking my pill regularly like I was supposed to but a few months ago I forgot to take it for 2 days in a row and then I started bleeding but it was like my period but way lighter so ever since then every single month I start bleeding two weeks before my periods supposed to start and I bleed through those weeks all the way up through my period weeks. It’s really light though like I can get away with using liners instead of having to use tampons.