How should I handle thanksgiving dinner with family?

Caroline • Had an ectopic pregnancy resulted in loss of left tube in 2013. Now mommy of a baby boy and thinking of trying for another soon.
We didn't plan on sharing the pregnancy news until second trimester. We had an ectopic that ended very badly two years ago and this is our first pregnancy since. 
I'll be just shy of 12 weeks by thanksgiving and I have dinner with my extended family on my dad's side almost every year (grandma, uncles and aunts, cousins...). We are close and they knew about our struggle to get pregnant and the fact that we have been trying. I have had a rough first trimester so far dealing with all day sickness and now it's mostly a night time sickness thing so dinner time isn't my best time to be "normal" around people. I feel like if I'm there it's going to be so obvious that something is wrong with me and I wouldn't be surprised if someone straight up asks if I am pregnant.
What do I say if that happens? Do I even bother trying to cover up? Shohld I just tell them? I am so torn 😔