Help!

So I started my birth control June 11th on the first day of my period, cause my pamphlet says I would be automatically protected from pregnancy. I’ve had sex without condoms and I’ve been taking them all at the same time. I’ve been on it for over 2 weeks now . When I started I had break through bleeding which stopped after sex. I saw this morning I was bleeding.. could it be breakthrough bleeding or implantation bleeding?