Anyone have kids with a 3.5 - 4 year age gap?!

I wasn't ready to think about baby number two until now but now I'm starting to regret not trying sooner! 🙈 My son is turning 3 in a couple of months so if I get pregnant soon (assuming it does happen quickly as I haven't been able to schedule my implant removal until next month) there'd be a close to 4 year age gap. Does anyone have any words of wisdom?