Long heckin period or implantation??

Hi, so I’ve been bleeding for 21 days straight. But it has been significantly lighter than any other period that I’ve had..

I’m between paychecks at the moment (I get paid once a month and all my money went to bills)

I don’t want to convince myself that I’m pregnant and then not be, hence why I’m not talking to people in my life. One thing that I’ve noticed is that the blood has been more of a darker brown ish color rather than the usual red that I get. Typically I can only tell when I use the restroom.

I messaged my doctor about it but she hasn’t gotten back to me about it and I can’t help but to see connections to other symptoms which could also be from something else.

Any thoughts or suggestions?? Thanks!