When do you know if you’re done having kids?

Rr

My husband recently told me he wants another baby. We have 3- what many would say is a lot! But we have always felt like we wanted 4 and in my gut, I don’t think it feels like we’re done, like there’s another little piece to be added. But on the other hand, I’m not as excited about the idea of newborn days as I was with our other three. I feel like things are finally getting easier as our youngest is 1.5- and tbh I’ve been doing more stuff for myself and feeling less all consumed with being a mom and more excited about my own hobbies, goals, and life with older kids. Throwing myself back into the throws of newborn days and no sleep and someone crying every time we get in the car is a little daunting (plus giving birth again scares me!) but I’m wondering if it’s worth it if I don’t think we’re done yet? Thanks for listening to me babble