Early pregnancy at 6 weeks Gestational sac only

Hi mga mommy ask ko lang po ito last mens ko po is Sept 26 then Nov 9 nag PT ako positive naka 3 PT ako na positive then nagpa TVS ako today pero No fetal seen yet only Gestational Sac palang 6weeks0days sabi naman too early pa daw and may OB as well told me na okay pa naman since its too early as long as no blood dischange and abdmoninal pain advice to repeat TVS after 2-3weeks. May naka experience po ba sainyo na ganito na eventually nag develop naman si baby after 3 weeks? Or naging blighted ovum nalang? Pls help me to understand this po I'm worried. Thank you so much 😊