Movements and placenta position

I have a posterior placenta and so was told I would feel all of my baby's movements. I felt flutters at 14 weeks, full blown kicks by 17 weeks as well as my fiancé could feel kicks with his hand, and now at 19 weeks my baby kicks all day long and I can see my belly jump when she does it. The kicks are super strong and I also feel her wiggling and even when she turns!  I have been answering the "when will I feel it" posts and it has me curious because I rarely see anyone say they have a posterior placenta and felt movements by 17 weeks. Most women aren't feeling anything until after 20 weeks. I would like to know if having a posterior placenta is just uncommon. Simply curious! 

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