Uh Cancer? (PLEASE ANSWER)?

yes this is going to be a bit disgusting so if you cant handle reading about stool dont read on.Okay, so for the past couple of months I've been eating healthy cause ive been seeing this nutritionist and eating all fish and vegtables and fruit and the only milk products (beacause im also trying to lose 90 lbs) i can have are yogurt. But lately ive been having trouble.Ive been constipated and when i do go i usually have to use laxatives, fiber powder AND other things. I also bleed too sometimes when i go, i heard this can mean cancer? IS THIS TRUE FOR ME? plee help me. Im so sorry its so long.