So you have no clue except that your sperm might have gotten in her? I seriously doubt it would happen from a medical view.
1. What time in relation to her period was this
2. Sperm was on your penus, not being "shot" out like in sex, so it would be very hard for it to even reach the uterus.
blah blah blah, don't start anticipating anything untill her period comes around and it ain't there