Rising hcg' but no sign of baby

Jacqueline
My last period was 13 oct. According to the doctor I'm around 7 weeks. I found out I was pregnant on 14 Nov with a very faint line. I was two days late on my period. Aunt flow cell on 15 Nov for two days and started to taper off to a light brown discharged by the 17th. The 18th I was still getting a positve on my hpt. So I went to the ER and they said my hcg level was 81 but couldn't see anything on the ultrasound. The doctor told me I was either in the late stages of a Miscarriage or just newly pregnant and it was too early to tell. They said they wanted to see me in two days. 21 Nov my levels where at 320. Still no sign of baby. Slight brown discharge no cramping. Two days later my I was at 1497. They said they wanted to see me in a week. I went to the ER again two days later for cramping and brown bleeding. My levels where at 2700. Still no sign of baby on the ultrasound. Sent me home. I went for a follow up two days later and they said my levels where at 3300. On monday two days later....5 dec my levels are around 5700. Still no sign of baby or anything ectopic. I'm still getting a light brown discharge with minor cramping here and there. Nothing really painful. I'm really worried. Could I not be as far along as I think? I really feel this isn't going to be a viable pregnancy. I'm really worried