I would suggest you to compete the 6 week duration and get X-ray done after removing the cast. As you have chief complains of shivering body pain and stomach pain I would suggest you to take complete rest and avoid travelling and visiting hospital.As you know covid19 epidemic you need to have strong immunity and stay home stay safe
Next Steps
For complications and cast related advice you can follow up with online Consulantcy
Health Tips
Avoid stress on left hand,eat well stay hydrated,
Stay home stay safe