How can I loose 12lbs in 2 weeks so I can fit into my dress?

12lbs in two weeks is in no way healthy.

If your serious about making the life changes nesecairy to lose weight and live a healthy life I'll point down the correct road; but if your just looking for a quick thing to look good and you aren't serious about the long term healthy weight loss than you'll never be able to lose and keep off those 12 pounds.

And why 12, why not four, eight, or ten? Why are you trying to lose weight so quickly?

No, you may get it in 8 weeks if you watch diet and increase exercise

If you have to wear that dress in two weeks, perhaps it can be altered to fit you at this size