I had sex with my girlfriend, she pulled a bad joke by telling me she was pregnant, after they I am afraid of having sex, what should I do?

Find a new girlfriend.

Yea that sounds good

Tell her not to do that again.

Stop having sex if you aren't ready to be a father?

Use condoms. Find another woman. That's a mean trick.

ANY time there is penile insertion there is the risk of pregnancy. You can reduce the risk using condoms or other forms of birth control, but not eliminate them.

Therefore, if you are concerned with getting a girl pregnant, then do not insert your penis into her vagina. It is as simple as that. No one should engage in sexual intercourse unless they are prepared to have a child.