I did the EXACT same thing about 12 weeks ago, except I had a large (choc at top and bottom) sundae. YUM. But on my last mouthful,.... I remembered!! Don't worry, I think almost everyone does something similar at some stage. you'd have to be very unlucky for something to happen. I heard someone say the other day that she (midwife) had never seen listeria in her 20 year work history. Good odds I think!! xoxo