MIRITYWomen Racerback Sports Bras - High Impact Workout Gym Activewear Bra

In regular bra sizes in a 34D. Do you think I should get a medium?

I am a 40c or d; not exactly sure. which size will suit me? and also how good do they hold the chest? my chest won't bounce if i run or jump?

Size for 38C please? I ask because I see people asking about larger sizes and the chart does not match what they should buy....thanks!

I wear a 38ddd, what size should i order?