So you took BC for 1 day? Is there a reason why? BC is hormonal, and stopping and starting randomly throws your body out of whack. A female doesn't have 2 periods in a month, because you only ovulate once a month. Bleeding doesn't mean it's a period. It means you're bleeding for whatever reason.
Seeing as you had two bleeding episodes, count from your first one as your LMP and date from there.
I started back on the pill. Took 1 and then quit again so that might be reason for 2nd period
were you active? and if you were, were you on the pill?
Even if tests come back positive?
i highly doubt it. i use to have perfect on-time 7 day periods, then they got all retarded. i was skipping months, i had two a month for 3 months in a row. its annoying, but absolutely nothing to worry about! go to your doctor to see if you have a cyst (highly unlikely, but they wanted to check me for one, too) and keep in mind that many things affect our cycles, such as stress, diet, and exercise. im 99.99% sure youre a-ok:)