Can I take a pill to become pregnant. Not birth control I'm taking abot a vitamin or something

Errr no.
Lots of unprotected sex is what you need here.
Prenatal vitamins might help, but without intercourse, well...

No pill will make you pregnant.

If you are asking if there are medications that can "help" you become pregnant using the God given method to accomplish this, the answer is yes.

Just talk to your doctor.