When is it considered too late to have kids?

I'd been focused on my career thinking that having children could wait until my 40s. Then after period irregularities and having tests done my gynae/obs informed me that I have high FSH levels and that if I didn't try soon I would miss the opportunity to have children. I'm now 37 yrs old and almost 37 weeks pregnant. Every body is different and time unfortunately doesn't wait for everyone. Don't put it off too long unless you are tested and confirmed that your hormone levels can allow you to wait