Awaiting breast appointment

Hi there, will try and keep this short, just in need of some advice and reassurance really, last Tues evening whilst showering I found a lump on my left breast, next day I went to drs and she could feel so a blood test and mammogram appointment have been made for Thurs, I'm rather nervous (anxious person anyway) but my mum recently told me breast cancer runs in her side of the family, so since then my anxiety has been running wild, I told a few close ppl and alot said your young , it's probably nothing but this isn't helping ny mood etc, (I'm 30) have a young family, very supportive husband, just in need of some reassurance and advice really, many thanks xx