Thanks for posting your query.
Is there any localized swelling /persisting bruise
at the injury site?
You may have soft tissue injury
or hairline fracture
You should consult with orthopedic surgeon and go for x ray of the affected leg on urgent basis.
If hairline fracture is present then there is requirement of plaster.
If soft tissue injury is present then it will heal spontaneously although it may take time.
If your condition wont improve then you should go for arthroscopy
of affected right knee for clarification.