You can't. In fact, the man does not even need to ejaculate inside the woman for her to get pregnant, the moment penetration occurs, you run the risk of getting pregnant. Luckily, there are several...
Why would you do that?
Chances are good granted the sperm didn't spend too much time in the air. Once it drops below a certain temperature or drys it will no longer be viable and you won't get...
Unless the semen is entering directly into/near/beside the vagina, there are no chances of pregnancy. As for increased chances, there has been some studies f that show a correlation between exposure...
You need to tell some of what you've tried and what you notice is happening with your body. More specifics may help in the answering of your question accurately.