You should not worry .
But consult a doctor .
you need to get done X ray
of neck AP and Lateral, and Chest with Abdomen in standing position.
The X rays will tell you whether you have swallowed the pins or not.And if swallowed then where are they.If X ray facility is not available then for neck you can get done Flexible scopy which can tell if the pin is visible.
In doubt do reply