Positive but not seen

Hi supermoms! I am about to be a first time mummy (praying hard!). After 2 years of trying, we finally got positive results from 4 different kits and they are not faint lines at all. So is it normal that docs arent able to see the baby/baby sac via the ultrasound? Please advise, thank you! 😊#1stimemom #firstbaby