If it doesn't clear up it might not be a bad idea to have it checked out.
I don't have IBS that I am aware of. It does seem to improve a bit when I go to the bathroom.
Do you suffer from IBS? I am just asking because I do and sometimes I have problems in my lower left abdominal when I am constipated. Is it relieved when you pass gas? If so then it might be due to gas.
If it doesn't go away in a few days you might want to see your dr.
Good luck...