Nausea post miscarriage

Cynthia • 30 years old and have a wonderful boyfriend, Bryant, and a 10 year old beautiful little girl, Alyson.
Has anyone gotten sick right  after miscarriage? We lost our baby last Tuesday and my hormones seem to be going back to normal but today I woke up nauseous and want to throw up my lunch. I'm back to craving crackers and ginger ale. 
It's only been a week and yes we've been sexually active. But I think it would be too early to have conceived already. 
I'm not sick (flu, cold, etc...) 
Has anyone experienced this before?