In the contemporary US, there are things you're (still) allowed to say and things you're not allowed to say.
You're allowed to say that, if you have fair skin and a disinclination to get skin cancer, you ought not sunbathe. It's okay to say that if you have trouble stopping at one or two drinks, you ought not drink at all. It's okay to say that, if you have a family history of diabetes and heart disease, you ought not eat lots of sweets and other junk foods. And, while there's no shortage of people who want to sell the notion "you can eat whatever you want, whenever you want, and still lose weight" and no shortage of people wanting to buy that notion, it is still okay to say that people who do not want to become fat should avoid the couch potato lifestyle in favor of a more physically active one.
But it is not okay to say that, if you are in such a situation in your life that a pregnancy (yours or your girlfriend's) would ruin your life--i.e. cause all sorts of problems for you and wreck your plans--then maybe you should not engage in the activity that creates pregnancy until your life is in a more stable state. You're not allowed to say that.