How do older women predict or know these things?

Okay so back in June of 2015 my mom flat out looked at my aunt one day & told her she was pregnant (we later found out my aunt in fact, did know she was, but was just waiting to tell the family until she was out of her first trimiester). My aunt who at the time was no more than 4 weeks ofcourse denied it. My mom never went back on what she said though, she even went & bought her prenatal vitamins. 2 & 1/2 months later my aunt revealed she was in fact pregnant via a family group text. I asked my mom how she knew, she said "I don't know I just looked at her & knew! I can't explain it" 
Today my mom texted to tell me she had a vision-like dream that I would conceive in December. How does she know December? Kind of hard to believe I will with all my struggles of PCOS & not ovulating on my own. We have been trying for over a year. Has anyone else's mother, grandmother or mother-in-law said something like this & it fell true? Just curious.

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