Dreams dictionary: Pin
Dreams dictionary: Interpretation 1
To dream that you are pricked by a pin signifies a sticky situation or relationship that is falling apart or that is unstable. You may be feeling anxious or feeling the need to hold together a particular relationship. Also consider the dream as a metaphor for someone who may be a "prick".
Dreams dictionary: Interpretation 2
Alternatively, to see pins in your dream refer to feeling of being trapped or immobilized, as exemplified by the phrase "being pinned down".