Been bleeding for 3 days as heavy as my period after first time sex, its still not stopped. Still have a week till next period. Should I be worried?

Possibly. Not all bleeding from the vaginal is menstrual bleeding. This could be a tear in the vagina or if your hymen was partially intake, it could be bleeding from that. I know you probably don't want to get seen, but you probably need to so it can be evaluated. In addition, if you're not on birth control, its time to discuss that as well. I hope you at least used a condom.