What does it mean when you bleed red blood, then it slowed down then, its pink. Pink as could be... Could I be pregnant??

From where is blood? From where are you bleeding? Nose? Stomach? Bowels? Presumably vagina since you're asking about pregnancy. Only way to become pregnant is to engage in unprotected sex. So you'll need to answer your own question. Best way to do so is to take over-the-counter pregnancy test if 4 weeks late after last period. Better yet, use some form of contraception each & every time. Condoms can prevent STDs too.