I had to take plan b on Friday almost 4 days ago now and im still having back and stomach cramps im not sure what to do about it. Everythingim readingonline says you shouldn't have side effect for more the 2-3 days. Edit: i tylenol and advil dont help me when im in pain. Ive had jaw issues for over 2 years had to take some much that it doesn't do anything for me unless its a tylenol 1,2 or 3