Here's a medal table of all nations participating in swimming in some way at the 2004 Olympics, per swimrankings.net.
http://www.swimrankings.net/index.php?page=meetDetail&meetId=1095137
I count 152 participating nations, of which 20 nations won medals.
It is your mom
To make it onto the Olympic program, a sport first has to be recognized: it must be administered by an International Federation which ensures that the sport's activities follow the Olympic Charter. If it is widely practiced around the world and meets a number of criteria established by the IOC session, a recognized sport may be added to the Olympic program on the recommendation of the IOC's Olympic Program Commission.
swimming
I participated in the deep swim program at Dolphin Cay in Atlantis while menstrating with no issues (took the appropriate sanitary steps of course). I don't see any reason why not. If you're swimming with dolphins in the wild, ask the dive people to make sure.
If "they" are a small, select group of people who participated in the Apollo program, then yes. Otherwise no.
Swimming was first included in the Commonwealth Games program at the first Edition in 1930.
ODP stands for Olympic Development Program.
It will vary greatly depending on the sport.
I am not sure who told you this, but it is a real event! If your asking why it is not and olympic event, its is because it is to short and the Olympic Program has no time for it.
4 minutes
The Olympic Games program consists of 35 sports
Golf was featured in the Summer Olympic Games official program in 1900 and 1904. The United States won the most medals at the time.RankNationGoldSilverBronzeTotal1United States (USA)334102Canada (CAN)10013Great Britain (GBR)0112Total44513