20 week scan anxiety🤞🏼

So I have my 20 week scan on Thursday and I have honestly never felt so scared in my life. I had high risk of Downs and Edwards and decided not to have further tests so had additional scan at 16 weeks which everything looked normal and was discharged for the fetal medical consultant. The reason I am so nervous is because I’m 19+5 today and still don’t think I have felt him move at all and at the 16 week scan they said I should as my placenta is posterior. I’m also scared they’ll see something wrong in the scan and my world will crumble 😩 who ever said pregnancy is easy?!