Try not to worry too much, it's very much wait and see I'm afraid! It may stop, it may develop into bleeding, it may not. If its going to develop into a MC (which is by no means even likely, let alone certain!), then nothing you do or don't do will change it. Do you have an early pregnancy unit where you live? Can you self-refer? If not, call your GP (or MW if you're booked in already) and get referred, even if you have no more discharge, as its the only way you'll be reassured things are ok. If you begin bleeding very heavily and/or start to feel unwell, that's when you need to go to A&E.
I am also 7 weeks and last Friday had a huge bleed - I mean a gush of bright red blood followed by steady heavy bleeding. I had a scan on Monday and saw a heartbeat! Have to go back for a second scan on Wednesday but so far so good. Take it easy xxx