I know this is nothing scientific, nothing really amazing, but I have $.02 that I would like to add here. My husband and I had our first two kids, and they were total accidents, I mean BIG TIME WHOOPS! After about 2 years after our second, I tried for two years to concieve a third. I say tried because we were consciensly trying to get pregnant. I started getting stressed out that I wasn't getting pregnant, I was always watching my cycle, taking my temp, yadayadayada. This includes one early miscarriage. After two years, we decided that it was no big deal, we were going to stop trying because we were getting edgy and anxious and we were really unhappy and disappointed. We didn't want to live our lives like that, so I decided to be grateful for what we have, especially each other, and gave up trying and just enjoyed sex again, enjoyed being intimiate with my husband instead of thinking "I must conceive this time, conception, conception, conception!" Lo and behold! wouldn't you know that two months later I skipped a period and now Logan is here! I really think that stress messes with is. It has to. I have noticed that people who "try" have a harder time getting pregnant while those that just enjoy their relationship have no problem. There are those who do have some problems, of course and I do feel bad. But don't let it stress you out or steal the joy out of your life. Enjoy it. You never know what could happen!
Missy