Momo twins

Hello

So it’s been confirmed that I am carrying Momo twins , I am 18 weeks gone but the funny thing is I don’t feel pregnant at all. I feel flutters some days and nauseous like once or twice a week. But I am very energetic, I don’t get headaches, I eat everything, I don’t get irritated with any food or smell. Some days I forget I am pregnant! Is this normal. This is my second pregnancy, my first was a very rough experience, I was always admitted in the hospital cos I had severe vomiting.