Hi, im 30 married with a 6 year old so not much difference between us!
I am going through the same process as yourself, although just a little bit ahead!
6 days is really quick! So that is good! The days may seen like they drag between now and your appointment, do as much relaxing as you can you deserve it! Lots of bubble baths, your favourite hobbies, be very very kind to yourself. I waited 14 days from referral by GP to attending clinic so literally the last day of my 2 week referral! It was torture! But i tried my hardest to distract myself with things that made me happy and i got there in the end 
Not sure if you have read much about the appointment itself? But i will tell you what happened at mine, hopefully can prepare you a little so you know what to expect.
Firstly i was asked to change into a surgical gown, and then i met the breast consultant who done my physical exam. He circled areas of concern and filled in a form with family history and so on and asked about any symptoms id had.
Then he sent me off to another department for ultrasound. Because of my age they didnt do a mammogram. The consultant said that mammograms give off radiation whereas ultrasound doesnt, so they dont like to expose younger women to the mammogram radiation. We also have denser breast tissue which is more difficult for the mammogram to see anything!
I was scanned by a radiologist consultant, and there was an assistant in the room. The radiologist thought one lump was suspicious so she biopsied it there and then during the scan.
I have seen mixed stories about biopsy pain. Honestly i didnt feel a single thing! And im the biggest wimp! When she injected the numbing it was 1000x less painful than getting bloods done! I barely felt it. After that i didnt feel the biopsy at all. The only thing i did feel was the pressure of the ultrasound probe pressing down quite hard as the lump was quite deep. But again no pain, i was just aware that she was pressing quite hard.
I was patched up and off i went back to clinic. I think i was in the ultrasound and biopsy for about 20 minutes! Literally in an out!
Once back at clinic the consultant showed me my scan, explained why it was suspicious. He told me that the next MDT wasnt for 2 weeks and so results wouldnt be given to me for 2-3 weeks and that was that.
Off i went home! This all happened on the 14th July.
On the 17th July a letter went on my NHS App explaining to my GP what had been seen at the appointment and also that a biopsy was taken. Other than this ive had no other communication yet so just a waiting game.
I hope this helps you prepare a little for what is ahead
Please ask any questions you may have id be happy to answer if i can. I was talking to another lovely lady on here regularly, but she got her results the other day and they were benign thankfully!!! So looking for another person to chat too through this process haha xxxxx