Bleeding and scAred, help please!

Ok, I am between 5 and 6 weeks pregnant, today I started getting period like symptoms, being moody and I felt in my lower abdomen the way I feel before a period, like heavy and dull but no pain or cramping. Well I started bleeding :( it didn't last long and it wasn't a lot. At first it was red and would drip but it was only enough for 1 panty liner and quickly turned brown. I went strait to the er and they gave me an Iv and are testing me for Mis carriage. I am so scared. Is this normal? Could I be mc? This pregnancy was planned and I just can't imagine it. I'm scheduled for my follow up Monday to see if my hcg had gone up or down to rule out MC....but that's three days and I don't know what to do until then :/ I don't want to think the worst at all. Iv read that this can be normal. Advice and encouragement please?