When should you start becoming concerned about redness and swelling during pregnancy?

I know it is normal to swell (I'm 37 weeks), but when should you become concerned? I've only been swelling the last couple of weeks. Actually gained 7 lbs. in 2 weeks and it is getting worse. None of my shoes fit and my wedding rings don't either now. This has all gotten increasingly worse, especially the last few days. My legs are extremely red too. However, my blood pressure was fine on Monday at my appt. and I went to the wal-mart blood pressure tester yesterday and it was fine then too. Just curious, because I am SUPER red.