Bloody stool and mild cramping. Really freaking out this could be bowel cancer. I have a GP appointment in two days time and I'm terrified

Hey everyone. So, this morning I found red blood in my stool and mild diarrhoea. The latter isn’t unusual as I have IBS but usually if I avoid gluten and dairy I don’t have too bad of a problem. As far as I know I didn’t have either recently but I have never seen the latter symptom before. It follows a few days of not pooping due to very high stress (my sister got married and lots of family drama ensued) but again, constipation is not unusual for me but the blood is. I have sort of like mild cramping but it’s the wrong time of the month for PMS (I track carefully) and this was definitely in the stool. I’m really freaking out that this could be bowel cancer, I know that it’s unusual as I am 31 but if it was at the stage where I had symptoms I understand it’s already quite advanced? I guess I’m just venting, I’ve booked a GP appointment in two days time but I’m terrified…