Okay last month my period was pretty much non existant. there was just a little bit of spotting. This month i was 2 days later starting and it only lasted for one day! I'm on estrostep birth control but i do forget to take them sometimes and have to catch myself up. I also do have unprotected sex with my boyfriend but it's been over a month. should i be concerned? I'm usually pretty regular and i'm just lost right now.