Need some reassurience mommies!

according to my doctor I'm 4 weeks and 5 days which I think I'm a lot less than that. Went into the ER for slight cramping along with sharp pains the night before. They saw no sac on the ultrasound my hormone level is 10.4 and the pee stick said negative but the blood said positive. I am now having slight spotting but the blood is brown. I've miscarried once before and had complications with my last pregnancy. Does anyone think that this is normal? I'm at work and can not leave for any reason and I still have 4 hours left on my shift.