A question for all.

I am a smoker. I have smoked since I was 13 years old... yay 10 years. I have a healthy 2 year old son. I smoked through most of my pregnancy with him. I quit smoke around 24 weeks and had a non-stress test done and they told me to stop smoking again because he was getting stressed. Anyways back to the question. I love the first morning cigarette by far my favorite one but, this morning I started smoking and I started feeling sick to my stomach. I have never had this happen before even when I was pregnant with my son. I know I should quit so please don't tell me that. It's a lot harder than most people think. But, I am wondering if this could be one of those weird pregnancy signs...