Need advice...!

So I found out last week I was pregnant. LMP 8th June 2017. Some spotting and cramping caused me to go to A&E; to be checked on Saturday - cervix closed, hcg 163.

Lost a small clot yesterday and went to early pregnancy unit today. Had a scan (including internal) - nothing could be seen. Had a bit of bleeding (red blood). Bloods repeated and they've gone up to 277. They're now sending it off to have the progesterone checked and I'm to have another hcg check Wednesday. Anyone had this before? I'm so scared. I'm not cramping, having some slight twinges but not painful. This is my first pregnancy.

Xx