I dont think the discharge is anything to worry about, but if you are, go down to A&E and they'll sort out a scan and blood tests for you. I had a lot of bleeding and pain in my 1st tri which turned out to be completely fine, and they couldn't find an explaination for it at all.
I think nosebleeds are fairly common as well during pregnancy.
I can totally understand why you're worried. Im worried pretty much constantly and I haven't been through a m/c so it must be awful waiting for your scan.
I really hope everything goes well! Im sure it will but like I say, the A&E dept at your hospital can reassure you further if you get any worries
xxx