No nausea for the first time

I’ve been pregnant 4 times, my first was a boy and the other two were miscarriages. Now I’m currently pregnant for the 4th time at 7 weeks, and this is the first time that I haven’t gotten ANY nausea or thrown up at all. Every single time I was pregnant with the others in the past, I was sooo sick and constantly throwing up in the mornings. So I’m just wondering what this could mean? Has anyone else experienced this?