Here's my two cents' worth...
Tom is very right about the overdoing it. There may be some payback for pushing too fast.
If you're still having chills, your body is telling you it's not done with some of the primary stages of healing. That's not a surprise at all at two weeks. You're still in cardio healing, not cardio workout. The fact that you get away with pushing it doesn't mean it's necessarily helping.
Night sweats can continue for weeks or months, and may not be related to your chills. There is at least one thread about it. Hopefully, you are still checking your temperature several times a day, if you are experiencing chills.
Consider trying to walk more for duration than briskness at this phase.
As far as jogging, you may find a very unpleasant aftereffect from that bouncing. I was on a riding lawnmower at three weeks, and had no sternum trouble steering, but felt very unhappily jumbled up inside from the vibration afterwards. Your heart, lungs, liver, and other organs are still readjusting their positions with respect to each other at this point, if you had the full sternum split. Let them work that part out before you shake up the jar.
If you are not going to cardio rehab (I didn't), I would ask the surgeon's people what they think. I would certainly consider that jogging could reasonably wait at least as long as driving, which is keyed to average recovery of the sternum. For a heart recovering from being cut open (if you need to, look up some of the videos of valve operations to remind yourself what your heart went through), a little patience makes sense. And walking is an underrated exercise that is much harder to accidentally overdo.
We males tend to move ahead very fast, when we feel we can get away with it. Try to determine if it's really the recovery benefit that is pushing you, or if part of it is our common male desire to get past "weaknesses" and get back into control of our lives. You can trigger arrhythmias or tachycardia by pushing too soon, which you can find on postings elsewhere. That may set you back, or get you onto more meds, which are hard to get off of later (the docs hate to deprescribe).
Absolutely, jogging and running are great exercises for cardiac development, but you should get back into them when your heart is ready, not your head.
Best wishes,