A well-regarded fertility specialist told me that I wouldn't be able to get pregnant without intervention due to my age and related hormone levels (I'm 40). I discovered I was pregnant right before my husband and I were going to go through IVF. Fertility is a mystery.I have friends and family members who have had trouble getting pregnant, some for good reason, some for no reason. One friend had a very stressful job, finally decided to leave it, and got pregnant immediately after. My husband and I got pregnant without trying -- actually while trying not to -- while we were dating but lost the baby at 19 weeks for no known reason.After my "low fertility" diagnosis, I asked my fertility specialist what I could do to increase my chances of getting pregnant -- perfect diet, perfect exercise regimes, ovulation tests to be sure we were having sex at the right times, etc. He said alcohol reduces fertility (in both men and women) but that women in poor countries with poor nutrition get pregnant all the time. Again ... a mystery.