Late or possibly preggers? Please help!!!

Mercedes
April will be 1 year that I got off my birth control, I got my first period after 2 years that June the first few months I was irregular but the past 3-4 months the have been regular.... Till now. My original day to start was 1-30-15 then after telling glow it should have started on the 2nd and still nothing. Today after intercourse and cleaning up it saw blood not a whole lot but enough to make me THINK I started but have not bled at all to use a pad or anything rest of the day but have seen some spots on my panties and a little blood when wiping. So after looking back the 30th-now is 12 days after possible conception dates also that time being my fertile window. Idk what to think!! Am I over thinking it or not. I haven't had any symptoms other then being late but also haven't experienced any period symptoms not even cramps. Some one please help me.