Hi Soapsgal --
I am 45 yo. Many people cannot understand a woman over 40 even entertaining the thought of conceiving . . . . but no one is the judge of your life. Some women have a "normal" life (married at 22 yo, no financial upsets, a secure home, family & job) - - Some women's lives take the road less travelled with possibly some twists and turns. So what?
Don't let anyone judge you or get you down. Be healthy, be self-aware, have a support system. Babies, children, teenagers are awesome!!! If you have the energy and you have what it takes - GO for it!!
On that note the answer to your question is "YES". Women do and can indeed get pregnant naturally after 40 yo. Check out this website: http://pregnancystories.blogspot.com/
It's possible. Hormone levels and a totally healthy repro system - and good sperm motility - and intercourse timed around ovulation. God Bless Ya!!!
Stephanie