Could you start with arm exercises until your pelvic inflammation subsides? You can either get some light hand weights or use 440g food tins or bottles of water. It will only raise your heart rate a little, but it will helps you start building muscle which will both tone your arms and get you burning a few more calories while resting.
Here is a link to some upper body toning exercises using hand weights:http://www.weightlossresources.co.uk/ex ... r_body.htm
Whatever you do, don't push yourself too hard. It's better to give yourself a chance to recover fully before starting your fitness routine rather than pushing it and causing yourself damage or prolonging your infection.