Early ultrasound advise

Abbie • Pregnant with baby #1 so excited!!!
Hi ladies! 
​yesterday I found out that I am pregnant BFP YAYYYYY, clearblue says I'm 2-3 weeks pregnant :) me and my fiancé are thrilled!! 
​Went to the dr today and my HCG is 274 is this normal? apparantly because my clear blue says 2-3 weeks this actually means I'm probably about 4-5 weeks pregnant, anyone know if this is true? My hcg levels are 274 does anyone know if that hcg is normal? 
​I've been booked in for a scan tomorrow has anyone else ever had a very early ultrasound scan? They've booked me in because I have got a couple of health complications so they're checking that my baby is okay... Will I maybe find out a due date tomorrow or a heartbeat or even see anything or is it going to be a little to soon.. ??❤️?? I'm so excited I just hope this pregnancy is going to go well! Me and my fiancé are so unbelivably happy. Any advice ladies would be appreciated! Anyone else in the same boat? ?????