Is my cat randomly peeing around the house?

I've had her 3 years and she's never peed anywhere but the litter box. We recently got a new kitten. Maybe she's mad about the kitten? Doubtful since about 6 months ago we brought a kitten here for awhile and she was fine. The litter box is clean and my cat is female, so marking territory is unlikely. Also she poops randomly around the house. I don't want to have to get rid of her :(