constipation and now blood in stool

Hi all, potential tmi incoming.

In august I noticed I (22F) started having some constipation issues (my normal is bowel movement at least once a day if not twice, always has been) as well as bloating and left sided abdominal pain... these all kinda resolved since that point around october/november, although I still experience occasional abdominal pain in the left side/groin area. I started strattera 40 mg three weeks ago, I take it every morning with food. Right after starting, I noticed how constipated I was, but I know it can be a side effect. However, this morning after having a bowel movement, I thought I noticed a trace amount of blood on my tp but didn't react quick enough and had thrown it in the toilet. Tonight, I had another bowel movement (which is my normal but both were kinda sharp, not too much pushing but more than regular I guess) and the blood was clear on the tp with multiple wipes. This time, I could see a tiny bit of blood in the stool. Have other people experienced this? While I had the previous bowel symptoms I did get a contrast ct near end of oct that was clear and had stool testing that was clear so I really think this is due to the strattera, but obviously given other symptoms I am nervous (I am seeing pcp tomorrow which again could be overreaction but rather safe than sorry). I am going to stop taking the strattera as I see my psychiatrist in about a week for an update anyway, but again, have other people experienced the blood in stool? Please let me know!!!

update: dr did exam and no hemorrhoids or fissures, have apt. w GI in a month, recommended taking fibercon tablets at night, not necessarily concerned atm