No nausea? 😔

Luna • Baby Elle arrived 9/16/15 😍
Does anyone else have no nausea?? I'm feeling nervous I haven't had any yet. 7weeks today. I've had every other symptom possible though. 
I'm reading a great pregnancy book by Emily Oster and it's all fact and data based info on pregnancy (vs anecdotal) and one of the things she mentions is women who don't have morning sickness are more likely to miscarry. 
My ultrasound is this coming Monday and I feel like there will be no baby. I'm feeling so down.