Hello momshie! Swelling sa paa at 19 weeks is possible pero mas common siya sa later trimesters, kaya I'd really suggest checking with your OB just to be safe, better peace of mind, lalo na first time mom ka pa lang! A few of my mum friends had it early din and it turned out fine, pero iba-iba talaga ang pregnancy, so important na ma-monitor ng doctor mo especially kung first time mo pa.