I have thought about this often, though I have never tested it like you have!
It really could just be luck. But I'd definitely be worried like you.
Now you suspect it, why not go to your gyno and check things out? If nothing else, they might be able to put your mind at rest and really confirm whether it's possible to go that long unprotected (while making the conscious effort to "pull out") and still not get pregnant.
That being said, here's a little snippet of information for you I found elsewhere:
"Clinical infertility is defined as the inability of a woman to conceive after a year of unprotected intercourse, or the inability to carry a child to term".
But this refers to people who are actively trying to get pregnant, so take it with a grain of salt.
This is also interesting to know:
"The chances for a pregnancy in healthy couples who are both under the age of 30 and having sex regularly is only 25 - 30% per month. A woman's peak fertility occurs in her early 20s. As a woman ages beyond 35 (and especially after age 40), the likelihood of getting pregnant drops to less than 10% per month."
I'd definitely go for an appointment myself.
__________________
Whether we write or speak or do but look
We are ever unapparent. What we are
Cannot be transfused into word or book.
Our soul from us is infinitely far.
However much we give our thoughts the will
To be our soul and gesture it abroad,
Our hearts are incommunicable still.
In what we show ourselves we are ignored.
The abyss from soul to soul cannot be bridged
By any skill of thought or trick of seeming.
Unto our very selves we are abridged
When we would utter to our thought our being.
We are our dreams of ourselves, souls by gleams,
And each to each other dreams of others' dreams.
Fernando Pessoa, 1918
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