I always felt the same exact
pregnancy symptoms you mentioned, two weeks after conceiving.
In my 3 pregnancies, I was miserable with nausea, migraines, heartburn, fatigue, etc.
But now, I'm 7.5 weeks with my fourth child, and do not have severe pregnancy symptoms, at all. I went to the Dr thinking I had high blood pressure or something but instead, I was 6.5 weeks pregnant!! I only have occassional food aversions and fatigue.
All pregnancies are truly different.