Threatened miscarriage- support needed

I was shocked and thrilled to learn that I was pregnant after going  to the doctor for irregular bleeding. I had been experiencing what I thought was a period for over two weeks when I went to visit my ob/gyn. Turns out I am pregnant!  I have had mild bleeding (requiring a pad) that is sometimes brown and sometimes red throughout the day. My doctor has told me I'm experiencing a threatened miscarriage. My hcg levels were 1100 the first time tested and 1460 two days later. My cervix is closed and am about 4-5 weeks pregnant. Anyone experienced something like this or known someone in a situation like this where everything turned out ok? I'm so so scared of losing my baby.