When baby fever hits

I have 2 kiddos, my youngest is 4 now😭 thought I was totally done having kids, but I find myself wishing for one more sometimes. I’m 30 and feel like if I’m going to have one more the best time is now, Will this feeling go away? I recently was late and thought I might be, I was disappointed when my period showed, even though we are not ttc. My husband would be good either way , idk anyone else in this situation?