Kids age gap 4 yrs

Im 6 wks pregnant. My firstborn will be 4 yrs by then. I'm wondering if anybody here have or will have kids ard the same age as mine and how you are coping so far?? I get so tired easily nowadays as my toddler still clings onto me so I'm trying to imagine how it would be. Or is this a good age gap?? Firstborn just started on toilet training but haven't weaned off milk bottle.