Well I'm 16 & I thought I had just finished my period & a day later I started getting bad cramps & started like bleeding randomly again but it was orange & not red :o!? Omg am I going to die ?am I pregnant? Do I have a desiese

What you describe isn't all that uncommon (just about any variation you can think of happens) so I doubt that you are going to die or even have a disease.
So... let's ask the big question: have you had sex?? You asked if you can be pregnant, and of course you can, if you had sex. So when, how often, and did you use any b.c.