Raw chicken

Lauren • First time mum, pregnant with baby boy. Check out my pregnancy and baby milestone cards etsy.com/au/shop/littlepopsicle
Hi ladies, 
So I was making a salad at home and I cut up my raw chicken breasts and then thoroughly washed the chopping board but I have a feeling I left the knife in the sink. Then when I went to cut up my tomato I think I used that same knife to cut the tomato. 
I'm freaking out. It's been about 20 minutes since I ate the salad and I don't feel different. What should I do?