I really like the way you closed your request. I'd keep the focus on the tension between those conflicting needs and emotions next time you and your husband talk. Acknowledge the difficulties, and try to draw out his sense of his own needs. Clarify your own needs.
Needs are never wrong, even if they seem to be in direct opposition. They are still valid, and if you can stay in that mode, then you can keep talking until you find the solution that most nearly meets everyone's needs. This does require compromise, but often who would do best to compromise, delay or surrender certain needs becomes clearer with ongoing talk.
So, back to your closing thoughts. How about reframing them in terms of needs, stating them as positives, and change your 'buts' to 'ands,' which will not keep negating the statement that just proceeded the 'but.'
"I have valid needs and feelings that put abortion beyond my reach. I hope to have another child, and am worried that your feelings in this area seem to have changed. And as much as I'd like to have another, I would wish that bringing a baby would enrich and strengthen this marriage that we've worked successfully to fix. I love you dearly and I don't want to add extra stress to your life. And I'm considering my emotional and mental state, too. I think my life would be even more joyful if our family grows. Sweetheart, I really want us to understand each other's needs here. Will you tell me more about your hopes and feelings on this subject?"
From there, you can begin to look for ways to meet each other's needs; perhaps alternatives to the choices that seem to exist now. I hope you'll look into Non-Violent Communication as a way to respect each other as you grapple with a situation that's difficult for you both, but in different ways. Lots of information is available online. My husband and I have been using these techniques to very good effect for the past 10 years, but they are helpful even if only one person applies them.