One More or No?

Kirby
This isn't necessarily TTC, but it is in a way. I just need total outside opinion of all kinds. I am more on the fence about baby #2 than anyone else I've ever met or anything I've ever decided before in my life. 
Let me lay out the background. My husband and I got pregnant with our first when we were dating and weren't careful 1 time (no kidding-just once). It was rough. We were young, broke, not good jobs, the works. I love her to the moon and back but to say that she didn't strain our already on the rocks relationship would be a lie. Things calmed down, we got better jobs, and later we got married. She will be 4 in May. I'm a high school teacher and I'm currently in graduate school for my masters. My husband has excelled at his job and travelled up the ladder quickly. We are financially very comfortable, we just built a new house. Things are good. Too good. Too comfortable. 
I never thought I would be a one and done mom but the more and more TTC #2 becomes a conversation (like I get off my period today and we planned on trying) after, I cannot help but feel so torn about doing it again. The baby stuff. The up all night. The car seat carrier and diaper bag and feeding and all of it. Plus, my first pregnancy, I was a wreck. Total wreck. I honestly wonder if our marriage can survive it. But #1 is begging and literally praying daily for a little sister (she knows that's not guaranteed but she thinks God will honor her wish lol). And he wants another. It's me. And our family brings it up all the time. 
So my question is have any of you felt that way? How did you decide? Did any of you just one and done and don't regret it? 

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