Rash all over abdomen three days after tubal surgery should i be worried?

Check it out: This is most likely an allergic reaction, possibly to the soap/prep solution used to clean your abdomen prior to surgery. An over the counter dose of Benadryl (diphenhydramine) will usually do the trick within a few hours. If not, it is worth checking with your surgeon to be sure that this "rash" is not a wound infection.

Contact dermatitis: Probably a contact dermatitis to the surgical prep used. Check with surgeon for confirmation and treatment.