Chicken

I went to a restaurant called "The cook out" tonight. I was craving chicken so I got a grilled bbq chicken sandwich. Where ever I go to eat I always cut my chicken sandwich I half to insure that it is fully cooked. When I pulled it apart I noticed it had a slight pink tinge to it. I kept trying to get it in a diff light to see it. I asked my husband how it looked and he said normal. As I was almost done with the first half I noticed this dark redish brown spot and stopped eating it. Hubby went and got out money back. I've never cooked chicken so idk if it can look like that and still be fully cooked? I'm worried because I'm 12weeks pregnant and don't want it to effect the baby neither do I want food poisoning. Is it normal for chicken to look like what I described?