What would cause a pain in the chest? The pain started in my chest and rib cage. Now it is in my chest and the pain has gotten a little worst.

Many causes. There r many causes, most important is 2 r/o the serious one like embolism, esp if on b/c pills. Others can b pneumonia, pleuritis. B cn now 2 r/o pe and also get a solid DX from ur pcp or internest.