You have to learn to trust/follow your 'instincts'. [=to trust your feelings about what is right or true even when you cannot be sure that it is right or true]
Her 'instincts' told her that something was wrong. [=she believed that something was wrong even though there was no obvious reason to believe it]
Her 'killer instincts' have helped her become one of the top tennis players in the world.
(..) - Enough of this twaddle. Come on! Not quite what you hoped for, Mr Powell? Oh, Lara, I have a gut instinct about this. After all, you are the daughter of a genius. Let me test my theory. You had to let him go. No more bubbles. (..)2001 Lara Croft: Tomb Raider