To give you an idea of how ridiculous anyone trying to diagnose abdo pain over the internet based on a tiny bit of info from OP, here is a list of possible differentials for right lower quadrant abdo pain...
Colonic: appendicitis, colitis, diverticulitis, IBD, IBS
Gynecologic: ectopic pregnancy, fibroids, ovarian mass, torsion, PID
Renal: nephrolithiasis, pyelonephritis
Pain in any location: Abdominal wall: herpes zoster, muscle strain, hernia
Other: bowel obstruction, mesenteric ischemia, peritonitis, narcotic withdrawal, sickle cell crisis, porphyria, IBD, heavy metal poisoning
And this is why trying to guess the diagnosis on Mumsnet is a really silly game to play.