I once began looking for a job about a week after I started a new one. I wasn't completely sold on the company when I accepted the offer - I had some misgivings

I once began looking for a job about a week after I started a new one. I wasn't completely sold on the company when I accepted the offer - I had some misgivings about the culture - and later wished I had just declined. After a week I knew my gut was right and I needed to get out. Of course it was more difficult to find a new job since I had just started one but I was honest in my interviews and after 90 days I left for something else. Trust your instincts.