Positive FIT test

I’m 40 years old and I’ve had what I thought was an upset tummy for almost 4 weeks, for 2 of these weeks I was passing almost water like poo (sorry for the info) horrific smells, tummy noises and cramping.

Now for the last 2 weeks, I am constipated for 3 days then have a day of loose poo then back to constipated, the smell is much better as are the tummy noises and the pains. 

doctor did blood tests - all clear and so asked me to do stool tests for inflammation, infection and a FIT test, just had a call to say all inflammation and infection were clear but there is an elevated blood result in my FIT test and I'm being referred 2ww to hospital.

I have no other symptoms and im sadly not losing weight - does anyone have any experience with whether this sounds like cancer or something else?

I have 3 children and im trying to put on a brave face for them but im so scared

thanks for reading and wishing you all well ️ ️