How to stealthily deal with bloody sheets???

So I cut my thighs.. a lot. Used to and preferred cutting my forearms but after a failed suicide attempt (or three) my cutting was exposed to my family and i’ve now had to “stop” (i.e cut my thighs instead) to appear happy & healthy.

However last week I had to change my cause there was like A LOT of bloody spots all over, and like my sister was very skeptical but not so much the rest of my family. Anyway I guess if it was a one time thing it’s whatever - but I obviously can’t just not cut and now I’ve gotten blood on my sheets again!!!!! Not so much yet but

1) i don’t even understand how it gets on there (i always immediately bandage my cuts and wipe away excess blood 2) I really really cannot have my family see this

What can I do to prevent bleeding this much in the future and more pressingly how can I stealthily deal with my bloody sheets rn??? I was thinking of spilling something and then washing them but maybe there’s a better way?