I feel so bad for you OP. If you don't mind me asking, did your significant other tell you that he was a transsexual, ever? It seems like he just laid it on you after you tied the knot and right when you were planning on having a baby. What I'm about to say is really politically incorrect in the trans community but I'm entitled to my feelings and I'll say it: you have every right to feel lied to and betrayed and if you think the best thing is fresh start, I'm sure any understanding person would agree. And don't forget there was a significant change in your relationship that really is a game changer.
I feel I am qualified to say this because I have only ever been with one woman in my life and as soon as things became serious, I told her I was trans. She thought I was just really feminine. We didn't break up because of it and she was supportive, encouraging and prob wanted me to be girl more then I did at the time as I was still scared of societal reaction. But also understand before she dated me she wasn't looking to date men anymore and wanted to pursue a lesbian relationship and be the dominant partner. I was the perfect fit. But she changed and we never got married and I don't blame her or hold any ill will. We were best friends for a year after we broke up too. It was amicable. Though it did hurt. I wish I could talk to her right now. She was the only person that ever supported me.
You seem to be young and are prob about my age so I don't think you would be in the wrong if you wanted to downgrade your relationship to just friends as hard as that would be since you are married. You deserve to live a happy and fruitful life and if you don't think you can with a woman, you need to consider your options. You don't have to make any decisions right away. Please don't feel rushed. But in all liklihood your husband is going to become a woman and if you are this upset now, wait until later. I really, really, really hope things work out for you. xoxoxo