first trimester... 1st pregnancy

Hi, good day to ya'll.. Tumpang tanya, last week sabtu i pergi scanning. Before that, im 7weeks2days as of today. First doctor buat abdomen scanning tapi tak dpt tengok foetus, so doctor decided to do vaginal scanning, sama juga dapat tengok sac saja foetus tak nampak.. is this normal? Do i need to wait for another 3 to 4weeks?? Size of sac 1.90cm... please if anyone of u have experience on this, pls do share me... its my first pregnancy... kinda worried...