[LuckyCharmz]

If you fear that there is something wrong, you should definitely visit a doctor and explain your concerns. We're solely volunteers here, not doctors.

However, it sounds like your first period. It could take a while for your periods to regulate, so while you might bleed heavily one day, you may have virtually nothing the next day, and so on and so forth. I was around your age when my periods became regular. Just keep an eye on things. If you have access, wear a panty liner or pad so you don't run any of your panties.