Let's clarify: If you haven't had sex you're not pregnant, so you don't have that to worry about.
Female menstruation (a period) is the lining of the uterus pealing, which can not happen if there is an embryo (a little baby :D) in development. If you're not on Birth Control (which doesn't mean you have to be sexually active! It can help with menstruation) and you're period lasts for only a day, I wouldn't worry too much about it.
If your period was on schedule but only lasted for one day, it's probably nothing but could be something more serious. If you're worried you should see your doctor.
Note if you've had sex: While it is highly unlikely that you are pregnant, there is always the possibility. If you fear that you are, prepare yourself by take a pregnancy test and contacting your doctor. This is also not medical advice. You should seek your doctors attention if you have any questions- always.
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