Here are some signs that you are in the wrong size bra.
1. Your cup wrinkles and caves in.
2. Your breast bulge out from the top of the bra.
3. Your underwire tip away from your body between your breast.
4. Your bra rides up your back.
5. Your straps dig into your shoulders.
6. Your strap fall off of your shoulders.
7. Your cup fits but your band is too big.