So I'm a ftm!! I'm 19+4 and I haven't had a ultra sound with my doctors cause there making me wait…

So I'm a ftm!! I'm 19+4 and I haven't had a ultra sound with my doctors cause there making me wait until I'm 20 weeks and 4 days!! Well I went to a special place called baby bliss to find out the gender!! When I went I learned my little girl likes laying on my placenta!! Could this have to do on why I haven't really felt her kick and I feel her move every once in awhile!! I'm really worried on why I don't feel her move much!! I've also had a miscarriage back in March so I also get worried over the smallest thing.