I haven't pooped in 2 weeks. What's wong with me?

It is very unsual and now it has got me all worried. I have not pooped in about two weeks now. I know I have a slow metabolism and I normally poop every 3 days but its been 2 weeks and I haven't felt the need to go. My stomach doesn't pain but I feel weird. I even drank green tea but it didn't work. What should I do?