I have studied your case.
Due to fall there is contusion
I will advise you if possible do X ray
of knee and you can consult me with reports or with your doctor.
Another possibility of knee pain
can be due to meniscus injury
,which can be confirmed by clinical examination and if required MRI
may reduce gradually.
Till time take analgesic
Hope this answers your query. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries.
Wishing you good health.