While Playing Aqua Volleyball, Someone Kneed Me On The Right

While playing aqua volleyball, someone kneed me on the right side. I could not take a deep breath or cough without hurting, had to have help sitting down and getting up, cannot twist, is troublesome laying on either side. Now, five days later, I still have all these symptoms EXCEPT when I take a deep breath it doesn't hurt all the time. Someone said I could have a fractured rib. Could that be the case?