Re: I need some advice/help.
Hmmmmmm ... Well, this is tricky. What you describe could very well be the start of your period. But, I still think there's a chance you could be pregnant because it sounds like you did have sex when you were fertile.
I'd just go out and take a test. By now, it should definately show whether or not you're pregnant. That way you'll know for sure. You can get a test for cheap at any major retail store like Wal-Mart or drug store. You also can take them for free at a crisis pregnancy center.
I wouldn't worry about your parents until you know for sure.
I bet since your parents are Catholic birth control might be against thier rules. (However, don't underestimate your parents----I'm Catholic too, and my mom put me on the pill when I was 16 without telling my dad, who is more religious---it was our little mother and daughter secret).
What you might want to do is talk to someone at the pregnancy crisis center about birth control. Planned Parenthood also is a good resource. Many offer inexpensive programs for getting on the pill (or shot or patch or whatever method you choose). Plus, since you're now sexually active, you should start having annual screenings (pap smears) with a doctor or nurse practitioner, which is what they'll do before they prescribe pills. It might seem a little scary at first, but hey--that's just part of being a woman!