My female spayed cat Togepi was a stray cat until earlier this year (round about March) when we decided to take her in. As a stray cat she spent most of her time outside and refused to use a litter box since she's used to going in gardens and dirt all her life. 

Recently she's become more needy and loving after her sterilization, and I decided to start keeping her inside, with open doors so she could go outside when nature calls. It's never been a problem before, but all of a sudden she started to pee on my bed. E.g. this morning I took her outside to pee and she didn't, came back to my room, and played for about 20 min, after which she jumped on top of my bed, looked me straight in the eye and started peeing.

Now I don't know what to make of this, since last week she was at a vet for a full examination, micro chipping, vaccines etc. In other words - health wise she's as healthy as can get. But she has never used a litter box before and now all of a sudden she keeps peeing on my bed. 

Note: She did it again later after I washed all my sheets too.

I have narrowed it down to either stress, or marking territory since she's only recently been allowed to wander about in the house and sleep inside. 
Also, I will be moving overseas soon and my family is moving to another house soon too- can this underlying stress be the culprit of this strange behavior?

For the check list:
\*I play with her everyday for almost an hour if not more, day and night
\*I feed her everyday
\*She sleeps mostly in my room
\*She follows me around like my shadow 
\*I give her plenty of love and affection
\*We have a litter box, but she doesn't use it, and I cleaned it as well, she still peed on my bed.

Any suggestions that may help?

[![Togepi](https://i.stack.imgur.com/M9SQL.jpg)](https://i.stack.imgur.com/M9SQL.jpg)