Oo, safe naman ang saging na saba kahit gabi, lalo na 16 weeks ka pa lang, plenty of nutrients diyan for baby! One of my mum friends ate banana every night during her pregnancy kasi laging sore ang paa niya, and the potassium really helped; saging na saba is even better dahil mas sustansya. Just make sure hindi ka gutom-gutom pa at kumain ng pili lang para hindi ma-bloat ka, pero hindi naman siya bawal o makakasama sa baby mo.