It is totally safe and very good for health. But since it can be a bit expensive in local markets, you can also eat apples or bananas which give similar nutrition and fiber. Wash it properly before cutting.
Yes, it is a very healthy fruit and helps with digestion naturally. Just ensure you wash the outer skin thoroughly before cutting it. If you have any specific food allergies, do check with your doctor once.
Yes, dragon fruit is 100% safe and actually highly nutritious. It is packed with fiber and vitamins, which help great with pregnancy constipation. Go ahead and eat it without any second thoughts.