Yep its definitely possible if you’re comfortable with it. I had a friend who was still feeding her toddler while pregnant but the toddler decided to stop because the milk tasted different…

I don’t think it would hurt.

If you feel comfortable then yes, keep breastfeeding.

Doing both would certainly be a drain on the body. You would need to have a very good diet to feed the baby inside you as well as the baby already born. It could be too demanding for some