when to be concerned about swelling

I'll be 38w on Wednesday. For the last few weeks my feet have started to swell a little. In the last week my feet have seemed noticeably more swollen especially my right foot. I've tried elevating my feet, drinking more water, and taking epsom salt baths. Nothing has worked. Today and yesterday my right hand and foot have felt uncomfortable at times (hand isn't swollen just feels off...). I have one copy of the MTHFR gene mutation so in the back of my head I'm a little concerned about possible blood clots. Should I wait till my appointment on Monday, call in and ask, or keep trying the methods (I haven't tried potassium yet)? What would you do?