Want one more baby so bad :(

I just turned 26. I have a 2 yr old and 3 yr old from a hellish marriage. I'm divorced. I have been with the most wonderful man for a year and we have been discussing plans for the future. We are working on buying a house. We know it will be a little over a year before we do so in the mean time we are renting. We have discussed what we would do if we had a child and split up ( we have been working on legal contracts for pretty much any aspect of our future. Yes my marriage was that bad ) I am going to have to have surgery due to cervical cancer. We are going to try cryosurgery first. But it usually leaves scar tissue and then chances of a baby are slim. Because of genetics and family history I will be having a hysterectomy soon. Most women in my family had ovarian uterine and cervical cancer which resulted in a full hysterectomy before 30. Our relationship is amazing. We are very happy together and he's great with my kids. If it wasn't for my babies I would wish I would have met him first. We started trying for a baby in June. I had a chemical pregnancy July. Now he's unsure if he wants to or not. I thought we would have more time but now I know we don't. I always wanted 4 and I am ok with just 3. I feel like this is a lose lose. I don't want to make him do something he doesn't want to do and he resent me for it ( my ex husband was the one that wanted kids and I didn't and he ended up resenting me for the kids and I wanted more ) and I don't want to resent him for not giving me the chance to have one more child. I try to talk to him about it and it doesn't really go anywhere. I just feel I won't be happy without that final edition. Or at least trying. If we try and do not succeed that is one thing. But not trying is something else. I don't want this to come between us but it feels like it already is. Any advice?