I Am A 40 Year Old Female. No Family History

I am a 40 year old female. No family history of colon problems or colon cancer. I use the bathroom regularly and my stool is soft and brown. I do not smoke, do drugs or consume more than a social/occasional amount of alcohol. I just had bloodwork done & everything is normal, no hypertension. I do not drink energy drinks or large amounts of caffeine or drink sugary drinks/soda at all. I eat plenty of veggies/fruits. I drink a lot of water daily. I recently noticed my stomach has been very bloated. Not gassy, just bloated, and more so than when I have am menstruating actually. I wipe and see a lot of bright red blood. What can that be?