Second time around

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Wondering if it's just me but with my daughter I got a linea nigra that ran all the way up my belly, but my belly button never "popped out". This time around no line but it looks like my stomach has a nose my belly button is out so far.. Anyone else? Wondering if it's a gender thing, or position (I do have anterior placenta this time) or jusy the weirdness of pregnancy haha...