...took plan-b.? She took plan-b 12 hours after we had sex, what are the chances of pregnancy. And fact, pre-cum does not contain sperm unless the man had ejaculated recently and did not urinate or wash before having sex again, allowing the sperm from the previous ejaculation to still be in the urethra, and when the pre-ejaculate is secreted, the sperm is then pushed out if he has not urinated before hand.