Found in the spellings of Atkinson, Aitchison, Acheson, Aicheson, and Aitcheson, it is as a patronymic form of the medieval male given name Atkin or Adkin, itself a double diminutive of the Hebrew name 'Adam', meaning 'red earth'.
But for natural conception, age rarely keeps women from getting pregnant until they are over 40. Even in their early 40s, though, most women are still able to get pregnant, especially if they use ovulation prediction.
Yes, you can still get pregnant. I am still nursing my 15 month old and am 4.5 months pregnant with baby number two. I did not know when I was ovulating either so you just get to have some fun. But, what will prevent getting pregnant the most is the throughout the night nursing.