Swelling!

I'm 36+1 days today and I'm pretty petite my hands and feet are very bony but today i was walking around the house and felt soreness in my right foot looked Down and it had swelled up like a balloon! Just my right foot a lot more than my left! Does anybody know why or if it's serious to just swell on one foot like this? It's not super painful but it looks funny to me since my toes look like sausages I've never seen that before and to add my husband jokingly said my butterflies gained weight... 😂😂 but I really hope this is not anything serious lol!