Mandy,
just like ScubaScott and the rest i get bloody mucus at the end of each dive, i used to also get a similar mucus when i was just doing laps at the pool - must be water or something that frees anything in my nasal cavity! I try to equalise really often, slowly ascend and descend, but it still keeps happening - however it has dropped in magnitude from my first check out dives, hopefully it will keep on doing that too! Was a real shock when swimming around to see that little bit of blood trickle across my mask.
I found that my first few dives i tried the valsalva method (pinch and blow) didnt work for me, and seemed to aid the blood creation in my nose, however moving to the toynbee (swallow or pump tongue towards throat) has really helped and the blood in my mask is minimal now to the point where i hardly notice it.
Again the mask clearing before the rest of the boat sees it is helpful, however i always ask my dive buddy (girlfriend who started OW training with) if i have some just in case it has changed substantially.
Saw the ENT, nothing really there, so not much that could be done. However every morning i wake up a little congested, probably an allergy or something - only since i moved to FL however!