<human>: When I was a teenager my mom and I were talking about when our family started. My aunt and uncle got married the same weekend as my parents. My mom was telling me how easily/quickly she got pregnant (I'm sure this was in part to instill in me the risks of sex) She said that she was under the impression that it took a long time to get pregnant and was surprised that she got pregnant with me immediately upon trying. (There was no sex ed in her school system in the 70s and she couldn't talk to my grandma about these things.) I asked what made her think that it took a long time and she said that it was because my aunt (that got married the same weekend as my parents) had been trying for a long time with no luck.
            
I did some math and figured since they all married in July 1981 and I was born in April 1982, that meant my parents got pregnant with me right away…which meant that my aunt had been trying to get pregnant *before* she and my uncle married. As I was recounting this story yesterday to my boyfriend it started to dawn on me that it made no sense that my sweet, saintly catholic aunt would try to get knocked up out of wedlock back in the early 80s (when there was still such a stigma around it). I asked my mum about the story and my assumptions were totally wrong. They all got married in 1980. So my aunt and uncle tried for a kid starting right after the wedding. My parents didn't try for me until 1 year after the wedding, believing that it would take at least a year to work.

Could you distill the essence of the text into 1-3 sentences?
<bot>: Not knowing which year my parents got married caused me to wrongly assume that my aunt unsuccessfully tried to trap my uncle with a baby.