High Calcium Intake Foods

Okay so I recently began the contraceptive injection, and massive improvements to my diet.

However, the injection has been linked to bone thinning and osteoporosis so I have been advised to make sure I get loads of calcium.

What kind of foods should I be looking out for that aren't too high in calories? I am trying to use calcium supplements too but don't really want to rely on these.

Thank You x