yes it is smelly because it is gas out of your bum
Chlorine gas Cl2
The smelly gas that often accompanies active volcanoes is known as fumarole gas. This has the same odor as rotten egg.
That's so you'll know you have a gas leak before the concentration of methane in the air reaches methane's lower explosive limit.
A smelly fart formed from poo.
A missed period and positive pregnancy test are the normal symptoms of pregnancy. A feeling of gas in the stomach is a normal human sensation.
Could be built up gas on your stomach. Or pre cramps before your period.
No it is not normal. See your physician right away. You could be getting gas, air or fluid buildup and it is not normal before, during or after exercise.