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!