Aibu to be mortified? I'm staying with dm and df with my dc. Im not overly close to dm and df and definitely not in an over-sharing of personal information way.
This evening I was sitting on their sofa. I stood up and saw thick blood where I'd been sitting, made worse by my moving and stuffing it. Needless to say I'm on a heavy af and had leaked through my night time super towel. I got up and left the room in horror as I needed to sort myself out, I thought they'd notice the blood stain on their beloved cream sofa whilst I'd gone but wonder if the cat had hurt its paw or something 
When I got back nothing was mentioned so I sat on the stain to hide it, resolving not to move all night until everyone else had gone to bed and praying ds didn't wake on his monitor causing me to have to move 
Many cringeworthy hours later I'm safety in my bed, having hidden the stain all night, but Aibu to be mortified? earlier today dm was delighting in her wonderful cream sofas, which I've now badly bloodstained. I've hidden the stain by turning a seat cushion, tomorrow I must find a way to buy some stain remover and apply stealthily, easier said than done I suspect.