Am i still pragnant ?

oK so I have no cramps no bleexding. Theybtold me after first ultra sound that it looks like I am at about 5;weeks but there was no baby no hearbeat just a little sac. They did blood test and I am at about 15050 hcg level. And they said that at 15000 that they should hear heartbeat. Is that all tru? Is there anyone that was in simar situayion and the babt was ok. ... pleasr let me know I am soo scared. ;(