Morning sickness

Just curious, my first pregnancy I only got sick once, I did have heartburn daily, and I really wasnt even nautious that often. I had a girl. How many of you ladies have not had morning sickness the first round, but you did have it the second. Or hasn't had it either time. I'm currently 6w3d, have been getting heartburn at night and nautious here and there, wondering if I should expect it sometime soon. I have a feeling this pregnancy isn't going to be like my first one lol