Gut Feeling
Laura just wanted to spend all her time with Jack, so she frequently went to visit him at the bar he worked at. The main reason she did this was to spend some more time with him, but after a while of doing this, she began seeing hints that Jack might be cheating on her.
Feeling Uncertain
People who were at the bar started looking at her oddly, but Laura ignored her own suspicions. As we all know, she should have gone with her intuitions. Later on she learned that her feelings of uncertainty were more than just feelings.