I've been having this too..but I have a yucky mucousy problem anyway when not pregnant, and often have a lot to 'cough up' from my throat when I wake up, and when I have dairy etc, so it freaked me out seeing blood when I coughed in the morning..then I noticed that I had blood when I blew my nose and bit later the cough was clear and 'normal' for me. but yes I understand freaking out a bit at it at first!
I've also read that it is common to have bleeding from your gums after brushing teeth, but I haven't had that (yet). All for the same reason: increased blood flow and some hormonal stuff (isn't it all just hormonal stuff) that makes the little blood vessels burst easier.
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