Most likely that is hormonal spotting. If you are taking the pill correctly and started it when you were supposed to (sometimes they time it with a period), then I would not worry. And some women don't have the right combination of pill for them (too much progesterone can cause brown spotting). break through bleeding or spotting does happen sometimes o the pill. If it continues, talk to your doctor about perhaps trying a different one. If you start to feel anything else 'odd' then take a pregnancy test for peace of mind. good luck