I ordered a medium. I have a 34DDD chest, and currently 160lbs. Pre-pregnancy I was 130 with a 32DD and used to wear a sm/med. I believe I will be able to continue wearing this after the baby is born. The size should work for both! This tank has a lot of stretch and the material is remarkably soft! The length is perfect. I am close to 5’7 and it’s long enough to work out and jump around without tugging it down to hide my belly. The material is super soft, think similar to lululemon align material. Just be careful due to the material I am not sure whether it would snag with jewelry, pet nails, or your own nail. Hopefully it is durable because after day 1 of wearing it, I love it so far! I ordered 2 more.