pilotsbabymama

I just found out that I'm pregnant on May 13th. I'm so excited! My fiance and I went on Friday to my new OB, I heard so many great things about her and she's just great. They did an ultrasound and all that could be seen was the gestation sac, is this normal?? I'm going back on the 27th for another U/S.. will we be able to see anything/hear the heartbeat then?? This is my first pregnancy so this is all very new to me. Any help would be muchhh appreciated!