Walked in on my parents doing it?

On vacation in Japan in a little tiny apartment, with me, 12, and my brother, 8, in the apartment. They were naked in bed and said they were 'sleeping' and that i 'woke them up' but oooooomg eweweww. im only 12. and i think them cuddling together naked will be imprinted in my mind forever. EW. EW. EW. EWEWEW. i sure hope they weren't actually doing 'it', because we aren't having anymore children in our family and they dont have a condom (i think). and they've been fighting a lot lately which is even weirder. OOOOMG EW JUST EW . im so grossed out. it just happened like 5 minutes ago. should i go back it and tell them to stop or something? like oomg.