I have bloody stools for 2 years is this irritable bowel syndrome?

Hello, I have been sporadically getting bloody stool (very light – light) for about 2 years. I have been taking medications such as buprenorphine, diazepam, birth control, zofran, and also recently trying out buspirone. The blood in my stool has started way before starting any of these medications, and the consistancy of the blood in the stool has stayed the same since starting any of these medications, so my belief is that my medications are not a contributing factor, but may be. Like I said, it is occasional, maybe 1 or 2 times a month, and is quite painful and I can usually tell if it will be a bloody stool or not. (I am highly constipated most of the time as I don’t eat or drink much or have many fiber rich diets so I use the bathroom for stool maybe 3 times at most a week, but usually less.) Some more information about me, I am 20, about 110 lbs, 5’0 ft, female, and have a chronic pelvic pain disorder that has been unidentified by many doctors, leaving me with my chronic pain medication, Belbuca (buprenorphine at a microgram level dosage) and I have just recently started that medication. I have started getting the chronic pain about a year ago and saw doctors, GYN’s, emergency room visits, and no solution but possible “fluid in the ovaries that should go away.” It has been a year and could possibly attribute to the bloody stool, but as forementioned, the bloody stool has been an issue for 2 years, so before the pelvic pain began. My question is, if this blood is occasional and highly likely from lack of water and fiber intake, should I worry contacting my doctor/pharmacist about this issue? Could it be something more serious? Could it just be irritable bowel syndrome?