12 week scan

Got my 12 week scan on Friday and I'm petrified I saw baby on a 10 week ultrasound and everything was great but I'm just so scared of going for the scan and baby not having a heart beat anymore 😔 how do I calm my nerves im constantly checking to make sure I'm not bleeding its not helpful that my cervix keeps going from to high to low and my bloating has basically disappeared 😕