4 weeks pregnant after MC, early scan?

Nicole
Hi Everyone, 
I found out yesterday I'm pregnant! Had previously had a miscarriage in March so I'm excited but really nervous. Has anyone had an early scan? Our local centre offers them 5-8 weeks and recommend 7 weeks to see a fetal pole and heartbeat. 
Also when can I expect any sickness? I'm feeling fine at the moment so don't know if that's a good thing or not.
Thanks x