Can kids tell if you're pregnant

Ma'Kaelah
Okay so for the past few days my niece has been clingy to me ...and she Randomly will run up to my stomach and rub it and she would say baby ... According to this app I'm 3 weeks nd a few days n I haven't tested yet I'm nervous but I read online that kids can sense a baby when you are pregnant what do u guys think? 

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