6 weeks pregnant and bleeding

Hey guys, I'm 6 weeks pregnant, and tonight while I was working out I started bleeding. I've always been active and I'm just worried. I spoke with the doctor and I'm going to see him Friday coming up. He said he wants to see how much more bleeding. It was red and I'm still bleeding nothing heavy but it's there. I just hope everything is okay. I can really use some advice right now. Thank you