Young teen needing help. ( Masterbation and ocd )

Hello ladies, and happy valentines day to all! I have come here in a panic with a fear that has absolutely sent me into do many panic attacks.

If you are not willing to help me, and answer my questions honestly, please do not comment.

I suffer from severe ocd, including contamination ocd. Now that that is said, let me tell you my worry.

Yestersay, my mom and i had went to the docter and to the store and to a fast food resturant to get food before she had to go to work.

Well, my mom left for work and i was left at home with my grandmother.

That night, after my grandmother and I had went to bed, I decided I wanted to masterbate, so i went to my room and I did. I fingered myself and rubbed down there.

Well, right after, I began to freak out.

This might sound so stupid, but I am TERRIFIED of pregnancy.

Im so scared that I may have had sperm on my hands somehow.

( Thats where my contamination ocd comes into play )

Can you ladies please help me and reassure me? Im really freaking out because I was ovulating.

What is my chance of pregnancy?

And

Will I become pregnant from this?

Please answer my questions honestly and nicely. Thank you!