Kinda worried

Hey ladies! I'm now 5 weeks pregnant nd today while using the bathroom I wiped nd saw a little bit of blood so I went to the hospital just to make sure everything was ok,. When I got there they said maybe it could a threat miscarriage when they try an ultra sound the couldn't see the baby because I'm too early I didn't even think to ask if they at least see a sac but I didn't so then they did a pelvic exam my cervix was closed nd I wasn't bleeding at all so they said tht was good now when they checked hgc level they came back a 32 ???? I go back Saturday morning to check again I pray they double by then ever happen to any of you guys? I'm trying not to worry but I'm scared