Signing a birth certificate, taking care of expenses, being 'okay' with a cuckold pregnancy is t enough. This is a great privilege. Make sure you unconditionally worship your bull-bred wife and show deep respect to not just yohr bulk but also his super
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.