Im not sure what too do Im 27 weeks pregnant and just found out have a girlfriend but want the father to know?

the father and I don't live in the same state any more I just moved back home with my girlfriend. She new I had with him and she is ok with having a baby with me. But she does not want the father to know and I kinda think he should have a fare chance. I don't know the father all that well but know that he is good with his other kids. I don't want child Support or anything I just am under a strong belief that the father has a right to know. It was not planed and we did use contraception but you know stuff happens. I don't want any ones hate full words about gays s or bis I think that two girls are just as good parents as a guy and a girl or two guys would be all situations have there down faults and could do just as crappy a job raising a baby... any way I am only asking because I am torn I want to just move on and pretend he was a sperm downer but I know that he is really good with the kids he already has and if the baby was to some day ask about her father I don't want to be one of those people who lie and say I don't know who he is.. I rather not have to contact him because it was again just a one night stand and I really did not even know him which sounds really bad but things you do when you have a drink or two in you... I know I will be a good mother but should I give him a chance or should I just move on and take as best care for my baby as I can. My girlfriend really wants the baby and we had talked a lot about having a baby in the past four years.. But this one was not planed... So again not sure what to do. Again I don't need any ones ridicule about how bad it is for gays and s to have baby's together. Because again they will do just as good a job raising baby's as any one else in the world. Please only real answers no hate crimes thank you...