Nerves about scan tommorow

So I'm so anxious that I had to have my oh book a private anatomy scan tomorrow . I'm 18+4 days and waiting for my nhs one seems like a lifetime. I'm

So nervous and anxious . Can someone give me some

Tips or friendly words ? I've had three panic attacks already today :-(

Also, has anybody had a anatomy scan at the 18-19 week point ? Is it okay? Hoping it's not too early x