Appointment

Fl

So l am 4w6d and received a letter for my first ultrasound on 8th of May but the letter said nothing about being seen before that?? Baby #1 l was seen 3 weeks after finding out and it feels strange that they wouldnt even do a blood test first before booking me in for a scan? I'm in the UK. Anyone had the same happen to them? I don't know how l can wait that long without having had any professional even confirm my pregnancy...