Could it be

Hi, the likelihood that she got pregnant by you is very high. I mean, you ejaculated inside of her. The only time when you can safely ejaculate inside of her is when she is on her period. Any other time it’s a risk. I think you should definitely tell your girlfriend to take a home pregnancy test. But you will have to wait a little. If she is going to take a test then you have to make sure that it has been at least 10 days since the intercourse. Also make sure that she takes the test first thing in the morning when she wakes up. I am suggesting the test because the chance is very high that she is pregnant. Good luck man.