Three weeks pregnant and bleeding

Chelsey
I am 3 weeks pregnant, had my blood test done this week. I has a little bit of brown blood earlier and I just thought it was implantation bleeding but a few hours later I woke up in the middle of the night with bright red blood soaked through my pajamas. I am so upset I can't stop crying, I am sure this means I am losing the pregnancy :( I was suppose to see my
Doctor tomorrow for my first apt.