Her womb, her choice. If she picks you, good for you. If she picks a bull, support her fully. Only a sexist husband will force his wife to carry hiq child.
Long ago my wife had a coworker that befriended her, then befriended me, then super slowly seduced her and I down a cuckolding path. He ended up being her bf while I was more of a third wheel. Oddly for us we loved the journey and the “mind fuck” asp