Could you tell me if my bra straps are kind of loose will my breasts start to sag?

Breast care: If your bra straps are loose, that means that your breasts are not getting much support. But it doesn't mean it is causing sagging. Breast health is very important. 85% of women are not wearing the correct size bra. Encourage you to go to a bra specialty store for a proper fitting as well as selection of a bra that will provide the necessary support. Take care.