Miscarriage?

So I went to planned parenthood yesterday because I've been bleeding for 3 weeks straight and this last week has been the worse. It's nothing but blood clots. One was the size of my palm. They made me take a pregnancy test & it came back negative so they sent me on my way, the only thing she suggested was to get on birth control which is something I don't want to do. Should I go somewhere else? Kind of freaking out. Any advice would help me so much.