dont't worry or it's going to spoil your pregnancy. Each pregnancy is different. A friend has a premature first baby and her second baby arrived a week or 2 before due date.
As for my personal experience, my first baby was 1 week late. When I asked the OB-gyn what about the 2nd one, he said that in most cases, when the first is late, the others as well. This happened: my second one was 3 days overdue!
For your swollen feet, did you exercise during the first pregnancy? By that, I mean exercise like yoga, swimming or just walk a bit everyday.