Doing the rice test will only give you a rough idea of size you may end up. You have to remember you are putting them over your current breasts and a bra over the top so they may appear larger than what they actually would end up.
If your implants will be placed under the muscle, you may need to adjust the size of your implant upward by about 15% from the amount you liked during your rice test in order to account for the compression of the pectoral muscle on your implants. However, the use of a sports bra during your test may help to simulate this compression effect, thereby giving you a more accurate result.
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