I have not had a bowel movement in almost two weeks, besides using a gel laxative once (which was not very relieving). should i be concerned?

Yes. Dr can examine.: Each person with constipation needs to be sure there is no other disease causing it. If constipation is just due to slow movement of the food and poop through the gut, then the things to try are vegetables, water, fiber with water, prune juice, prunes, polyethylene glycol, Senokot or other senna, milk of magnesia, other laxatives... A doctor can evaluate and solve the problem.

Dr Rosenfeld and another doctor agreed