Advice please, brown spotting and cramps - 6 weeks + 2

Bev

Ok so I'm 6 weeks, 2 days and having brown spotting every so often when I wipe and cramps that are more persistent than those I've had before. Dr has taken bloods and arranged for a scan on Wednesday but should I be preparing for the worst? This is my first pregnancy and I'm not hugely sure what to expect. I'd really appreciate any advice you can give.

Thank you x