Do you ever feel like this?

Currently, I am a momma to two babies 2 years old and under, and I am pregnant with baby #3. I've always said that 2 to 4 kids would be my limit however, I'm having a hard time accepting my last baby will be my last. Call it pregnancy hormones, but I feel almost like I could have 12 more and be completely happy. My heart breaks thinking this could be the last time I get to experience pregnancy and everything beyond that. I'd love to add another way later down the road, but my fiance doesn't seems to feel the same way either. I just feel like I'm at a loss whichever way I look at it. Yes, I'm grateful and entirely blessed for the ones I do have already, my heart breaks even more for the women who want more than anything to be a mother but their bodies wont allow it. I'm sitting in a bubble with my thoughts and can't seem to break these feelings.