age gaps

I have baby fever soo bad, but had pretty severe ppd/a after my first (Oct '16) . Somedays Im quite realistic in my thinking of how difficult it would be to throw another into the mix, especially if I suffer from ppd again, but other days (like today) I don't care! I am feeling it really hard today because I had a false positive (evap line). I feel like a little one is missing from our family but I always worry that doing it right now would be selfish and not considerate to my oldest girl. Anyone have any experience here? I know it'll be a large transition no matter when we pull the trigger I just dont know if I should be patient for a few more months or even years. I know every mom and child is different I'm just looking for feedback from anyone else that is in or has been in this position.