The sperm needs to get inside her and travel up to her ovaries where it meets the egg. Did any get inside her?
Not ejaculating inside her makes it far less likely that she would get pregnant.
Since things are sexual between you, have you discussed birth control options, or what you would do if she got pregnant? These need to be discussed now.
Also, have you discussed STDs? If either of you have been sexually active with anyone else, there is a chance you could have one.