It's hard to say.
First time I ever tried to make a baby, I/we was/were successful. (maybe the first, maybe the second or third, not sure, all I know is that a week after our wedding it was extremely obvious that something had changed, LOL)
But it seems that I am extremely sensitive to hormones. So with that conception, I was extremely sensitive to the hormones of ovulation, and all I needed was hubby's help.
But then with nursing, extended nursing, and extended nursing with a voracious kid, I was extremely sensitive to nursing hormones as well, and it seems obvious *in retrospect* that even though I was *apparently* cycling (from when DS was 4 months old, which is NOT fair with the 20 hours/day nursing I was doing) I probably wasn't actually prepared, body-wise, to make more babies.
And then there was the problem of hubby slowly developing a pituitary tumor, which went undiagnosed for probably 2, maybe 3, years. Despite his asking all health care providers to test his hormone levels. Despite his developing a cyst in his "breast" area and having a mammogram (and all the shame that goes along with it for a man in a woman's pink, female-centric-intake-forms, world). Without ANYONE saying "hey, let's check your hormones shall we?" Finally probably 3 years after it started to develop (going by symptoms that were mysterious and embarrassing at the time) he had his hormone levels checked, and, as the endocrinologist put it, found he had the prolactin of a pregnant woman and the testosterone of a teenaged girl. (editing to mention...he regales people with that quote ALL the time, even last night, he finds it to be hilarious.)
So that'll put a crimp in a couple's fertility, that's for sure!
Now he's all back to normal. So glad we have such high levels of meaningful communication and also healthy doses of humor about the whole thing...how else could we have gotten through his initial sperm analysis report where *everything* was wrong with those little swimmers? If we hadn't been able to laugh about it, how could we have dealt with that?
And all of that took time (thanks, so much, health"care" people who refused to check DH's hormone levels) and now I'm 41 and doing acupuncture and drinking vile-tasting "tree bark" tea to enhance the workings of my bod.
What I'm saying is...you can be as fertile as you can possibly be, but if something's going on with the other person, it doesn't really matter. (and if your husband is losing weight but gaining chest mass...have his hormones checked b/c that was one of the most obvious signs, along with the fluid-filled cyst, that doctors kept missing, before he was diagnosed with that prolactinoma!)