swelling??

I know mild swelling is common in pregnancy, but usually when you walking a lot or its really hot out right? is it normal for it to happen when sitting I have been get a little bit of swelling in my feet and hands nothing to crazy more my hands then feet tho but it seems to happen more when I'm sitting when I'm up moving around my hands are normal and my feet only do it when I've been standing along time or if I'm sitting upright is this normal? should I be concerned?