Hi @Trinny - Welcome to the blog - lots of support and useful information on what to expect ..... even some laughs to be had, to help cheer you up.
3 weeks is about 'normal' - tho I was lucky & had my appt in 2 weeks as I was diagnosed on Jan 5th & I contacted the office even tho it wasn't 'open' - and managed to get in on the first day of my surgeon's return from Xmas Holidays. The waiting is always hard - I've just had a callback on Dec 4th & it took until Dec 21 to get the biopsy done & I was going apeshit! (All clear.) That 'wait' never gets any easier.
Whereabouts are you (Town/city) - we may have members nearby who can point you to resources in your area.
Take care - in the mean time, try & keep busy, doing what you love doing - make sure you have a good buddy with you at your appointments as an extra set of ears. I even recorded my initial appointments on my phone, as the stress of the day makes it difficult to remember all that was said. Write down any questions that pop into your head - and just work your way thru them with the surgeon on the day.
He should have a Breast Care Nurse available to you, who should become your best friend for any other questions after you've gone back home - or just put them up here & someone will give you an honest answer.
All the best with your appointments xx