@Pahill My tumour was picked up early on a routine mammogram (and yes, I have a terrible family history). Because of my experience my best friend had a mammogram & got a call back which she attended the day before yesterday. She asked me about the statistics of biopsies. 30 - 40% come back with cancer. That's 60 - 70% that come back as benign. Yesterday my friend was told her two lumps were benign. You don't know yet which category you're in so try not to panic. Easy to say but harder to do eh?! We've all been there, take it one hour to the next.
If it is cancer, your next step will be to go to your GP to get a referral to a breast surgeon. The start of treatment is such a whirl but don't be rushed if you don't want to. Some of what happens will depend on whether you're a private or public patient. Take your time, take some deep breaths, ask lots of questions so you're clear about your options.
This forum is an incredible resource. There's no such thing as too many questions. Ask away! Hang in there.