How true is it that if you have an easy pregnancy you have a long labour? And vice versa?

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I had a high risk very difficult pregnancy, a long labor that ended in an emergency c-section--but on the flip side all worth it!

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My first two pregnancies i had easy pregnancies absolutely no problems at all. I had two very fast labors and i only pushed for 4 minutes with my first and she was 8 pounds 2.5 ounces. With my son i woke up with a tad of cramps and went in just in case cause i couldnt tell and when i got there they saod i was 8 cm dialated and super surprided i wasnt feeling any of it. Pushed for 10 minutes and he was 8 pounds 12.5 ounces. Both vaginal and back to work after 1 week of having them. 
This pregnancy i am high risk i have had such a horrible pregnancy and she has gastroschisis when the intestines are outside your body, and the beginning ive veen told this pregnancy is one thing from another. Anyrhing and everything has been wrong and ive been in pain. 
They say the more pregnancies you have the easier the labors get but who knows

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Old wives talr

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What's the biological reasoning behind why this would happen?

How true is it that if you have an easy pregnancy you have a long labour? And vice versa?

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