Anxious 1st time mum

Hi mummies, so i had past bad expriences.. now i am blessed again😊 16 weeks today. However i am so anxious all the time.. last scan was 2 weeks ago and next scan is in another 2 weeks time.. How will i know baby is healthy? I wish i could scan every week... 😅 hope to get some positive advise so i can relax abit and nt be soo paranoid😶