Waiting on core biopsy result

Hey I was on this afew weeks ago as I found a lump near my nipple on my right Breast.
So the dr was great had a feel and said it could be a number of things and said she would do an ultrasound to see and maybe a biopsy…but she kept reiterating the fact biopsy doesn’t mean you know what.
The woman who done the ultrasound was quite abrupt and said “your tissue is too dense I can’t see anything” go back to the doctor
So I went back and she said that basically she’s got a blank as they can’t see anything so would need to do a biopsy.
She kept saying it doesn’t mean it’s cancer it means it’s because I don’t know why it’s there. She’s like there’s a million different things it could be… but s part of me is still worried.
She’s asked me to come back next Wednesday for myresults… she was so nice but a part of me is scared…
I’m also sore from the core biopsy… I have s 9 month old and couldn’t even lift her Thankyou xx