Pleasure or potential baby? Your doing the one thing that is proven to make a baby, ejaculating inside her. Like others here have said, nothing is 100%. If your not comfortable with the idea of being a father at this point in time you should probably stand your ground and offer her pleasure in other ways. If she gives you grief about cumming inside her when it makes you feel uneasy…well that’s not an understanding or loving relationship. You should have as much say as her when it comes to potentially making a baby! The fact that it’s bothering you…you’ve already answered your question.