In 1st trimester I faced similar symptoms like you.. I had pain majorly at night..so I used to wear a soft bra the whole day... The hormones are preparing your body.. It goes away after 13 weeks... I would advice try to do some pilates and stretch exercises for pregnancy and moisturize your boobs at night... and it will help in blood circulation.
Could be reflux sometimes. Check it out with your doctor.
Mayb u need change sleep position