Need some advice...

My job requires me to travel interstate every so often, but I don't necessarily feel comfortable about flying during my pregnancy. I have been told that flying won't do any harm, but I'm being unnecessarily cautious because of my previous mc. And not only that, I haven't been feeling too well with the nausea and extreme fatigue.

Thing is no-one at work knows about me being pregnant and I don't really want to tell anyone until the 1st tri is over.

So my question is...should I just go? Or do I tell my boss the truth and not go?