I was reading emmas diary last night and saw this....
'Nose bleeds and blocked noses
Your nose may feel blcoked and even bleed if you blow it too energetically. Eat lots of foods containing vitamin C as this can help strenghthen the blood vessels. You could also try dabbing some petroleum jelly around each nostril, to stop the skin drying out so easily.'
I dont know if that helps, read it and thought id post it.
Its in page 68 pregnancy week 21 of 'Bounty, your pregnancy'