Hi 7WZ!
I am so sorry you have had to go through all this stress at the moment. This girl is not worth your time or energy - anyone who threatens to hit a pregnant woman is obviously a bit of a psycho and needs her head examined. Hopefully, your brother will eventually see what she is really like. Possibly try to build bridges with your brother by inviting him to meet you for coffee and just chat. I would avoid criticising his girlfriend at this point as he probably would just react and go on the defensive. Once you and your brother are close again, he will probably be very protective of you and see what a nasty piece of work his girlfriend is.
As for the discharge, I would ask midwife - probably just a bit of discharge - it increases a lot in pregnancy.
