I think I'm going to miscarry. :(

I found out on Monday that I was pregnant. Today, I woke up and my breasts were not sore and I noticed some brown blood when I went to the bathroom. I took 2 pregnancy tests and they both said negative. (When I took my 2 pregnancy tests on Monday, they were faint positives so I went in and had a blood test done and pregnancy was confirmed.) I went straight to the ER this morning, urine test was negative. However, blood test was still positive, HCG level was only at 5.  I think I'm going to miscarry within the next couple days and I'm completely heartbroken. I have not noticed any blood since this morning, other than right after a pelvic exam. Has anyone had this happen and ended up not miscarrying? I have an appointment again on Friday to recheck my levels.