Ultra sound no baby seen.

My • i am 27, happy married i have a 4 year old son. from mission hills california, 91345. hit me up.
So i just out that i am pregnant 6 days ago. Went to have an ultra sound at kaiser permanente but they didnt find any baby. They said its possible that its still early. Im so confused right now. And im so worried. Pls need your advice now. Im just breaking down is it possible?