How do you know how long your cycle lasts? please help !?

My first period in December was on the 24th-27th, then my following period in Jan was 4 days late....27th-31rst. It was late because i was stressing out over wanting to get pregnant so bad that it just took a while for it to come. I just dont know how a person figures out how long cycles lasts cause i know everyones is different but alot of people have 28 day cycles.....Im guessing thats why im not ending getting pregnant. We have been trying for 4 months now with no luck and not knowing my cycle length is a big possibility that we are not trying at the right time. I have been going by the start of my period and just counting 14 days later and having sex around that time. Sorry if this question is stupid im just curious!
 
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