About A Week Ago, I Experienced A "pop" In My

About a week ago, I experienced a "pop" in my right bottom rib. It felt like I had been shot, it happened very fast and very hard. Since then I have had rib pain there and I just thought I had maybe cracked a rib. At the time it happened, I was sitting at an angle, leaning forward and I coughed once, fairly hard.
The pain has been lessening over the last week, but this morning I woke up with a large bruise along my right side. It is about four inches high and 18 inches long. There is no pain associated with it at all, the only pain I have is still at the rib area above the bruise.
I'm a male, 57years old, 5'9" and 185 lbs.