Baby from brother. Big mistake
If you're soon to be ex-husband finds out what you did he will be glad to be rid of you. Incest is for losers. Hopefully, your child will have all of his or her fingers and toes and will have a normal IQ. Products of incest often display negative traits so you are not doing your potential child any favors by getting pregnant with your brother's child. I have known two children born of such a union.
One girl had a good IQ but her joints were undeveloped. She had a weird gait and her arms were stuck in a boxer like fetal position. A boy I knew had a speech impairment and I believe a borderline IQ. Leaning towards retardation.
Even if the child born of incest has a child of his or her own problems persist. A stupid friend of mine knocked up his office help who was a very unintelligent product of incest and his child by her was just a bit better off then her mother was.
Don't have another child with your own brother. You have already made one mistake.