Often there is a thread on here regarding severe hardship on relationship, crowded unfit home, NO money, kids playing up...and the op will mention she is pregnant with the 3rd, 4th, 5th and so on.
Having more kids on top of major problems = hell
There may not be a right time to have children but there is definitely a better time. And if there is no better time, accept that you don't have to have more kids and be happy with the ones you have. Life is unfair but it's especially unfair to bring more kids into very complicated set ups.
It's a trend I see even in real life. Madness.