Hello, this girl and I were involved in sexual activities

Patient: Hello, this girl and I were involved in sexual activities about 3 weeks ago. She has a copper IUD in place and doesn’t menstruate. During this activity, my penis went inside her vagina for 10 seconds maximum. I did not ejaculate inside of her but some pre-ejaculate may have seeped out. What are the chances that she will be pregnant?

Doctor: