Is Traveling At High Altitude Safe During Pregnancy?

Hi, I am about 8 weeks pregnant from Los Angeles and am planning a trip to Utah, Sedona and the Grand Canyon. Most of these places we were planning on staying at are above 6000 ft with the exception of Sedona which is 4500 ft. I ve read conflicting views on traveling at high altitude when pregnant...Do you think it is safe? It s my first pregnancy and so far I ve felt good, not too sick. I am healthy in general and have travelled to Big Bear, California which was around the same elevation and didn t feel sick. The trip will be about 10 days long. Thanks for your advice, Caitlin