Does time between pregnancies sway?

We are planning a final girl sway sometime in the future, but I was wondering if there is something to the space of time between pregnancies that may sway. We are considering trying for about a 20 month age gap between children for a girl sway, however I plan to EBF and hopefully use vitex to get my PPAF back after this one is born as with my first son I only had a first PPAF when he turned two.

We would like to try once this one I'm pregnant with turns one year old, should we go for a smaller age gap to sway pink or is a one year age gap still alright?

Closer spacing does sway pink IMO but 1 year is still a close spacing!!!