I never got morning sickness or heartburn or any pregnancy symptoms at all actually. I am 40+3 today. But my mom never had morning sickness either. Its just everyone is different and like Clysta said I think to many people think about symptoms and sometimes our bodies make up things...
Might I just add, you are LUCKY!!!! Lol enjoy it its perfecrly normal. Every womans body reacts different to pregnacy.
Each pregnancy is different, every woman's body is different.
A pregnant female doesn't have to have any symptoms. A lot just put so much importance on them, and really shouldn't. Symptoms are nothing more than how the body handles the hormones - even if you don't get it in one pregnancy you could in another.