I'm confused as to why he'd be OK for you to have more children, but doesn't want more kids even though he plans on being with you in future. If that's the case, then he'll have more kids - just by being with you. He may be in a very stressful situation so not be able to think stright. But if he's not willing to be with you, then he can't tell you who you can or can't sleep with. Sounds like he wants to have his cake and eat it too.

If the doctors are telling you to have children now or not at all, then it's your choice. Is there any wayfor public funding to freeze your eggs?(I have no idea about these things)

Another biggie to think about is the biological father has legal rights to the child if you have one including having to provide child support, shared custody etc. How much of your life are you prepared to share -because that's at least 18 years of communication, negotiation and shared parenting. I'd at least be ensuring the potential sperm donor has compatible values and beliefs about raising a child. It's difficult enough for parents in a relationship together.

It's a sucky situation to be in. I hope you canwork it out.