sac but no baby?

Krista • Love him 11.28.08

so i had missed my period i took a test said i was pregnant by using calculations im around 6 weeks so today was my first appointment dr said sac measures out to 6weeks 5days but no baby she believes im possibly earlier than i think or have whats called belighted ovum where a sac forms but not a embryo so she did my labs my pergnancy levels are 29,053 i have to do more labs on wednesday then another ultra sound monday any one experience this?