HCG level of 6? Pregnant or early miscarriage?

Tatiana • The mom, the myth, the legend ✨
I've had 3 positive test this month my first two where so noticeable and a little dark the latest one I took was today which was a very faint line but same brand if test.. It worried me some but I let it go a few hours later I started bleeding so I went to the ER I got a blood test & my HCG level was 6. My nurse diagnosed me with a threatend miscarriage she would even confirm if I was pregnant or not she said it is to early to know.. If I wasn't pregnant wouldn't my HCG levels be below 6? Do you think I have had an early miscarriage or I'm very early in pregnancy? I am 24dpo today. Any answers would be appreciated 

HCG level of 6? Pregnant or early miscarriage?