I know more than one woman who had to have rings cut off during pregnancy. Fingers change size for a lot of reasons -- water retention, warm weather, weight gain, injury, humidity. If you don't get your ring off before those changes take place, you might just have a ring that refuses to budge.
WikiHow has several suggestions
for helping you free a ring from your finger (or maybe free your finger from the ring!), including many tried-and-true methods like using soap, butter, or anything else that might make things a little more slippery. They also suggest soaking your hand in cool water or elevating it, if water retention is the problem.
But if those methods fail, there's one more thing you can try -- dental floss. Simply thread the floss under the ring, then wrap it around your finger snugly up to your knuckle. Pull on the floss, and as it unwinds, it should push that ring right up over your knuckle. Brilliant!
Take a look at the gallery below to see how it works.