I happily pay child support for my 4 year old son but the mother of my son is using the money on her self and now is pregnant with her husband's child. She is now threatening me that my child support will go up since she is having a baby. She said that since she does not have a job abd I pay half of the living cost for her to support my son she will show that she is not financial stable to have both kids so my support will go up to insure my son has the right amount of money to live. I would not mind paying more money if the state be lives my son needs it but if it goes up because of a child that is not mine I do not agree with that. Can she do that?