Sleeping on an air mattress...safe or not?

Chelsea

My husband and I are going camping with my family next weekend, and we always bring an air mattress. I'll be almost 18 weeks by then. We had some friends that said sleeping on an air mattress is not good while pregnant because of chemicals harmful to the baby. Is there truth to this? Does it matter if the mattress is new or not? Ours isn't new and works fine, but we don't have the box any more so I can't look to see if there's any warnings on it.

I'm definitely not sleeping on the ground, so any thoughts would be very reassuring and helpful. Thanks!