I went for a ultrasound it said i was 5weeks and 6 days but no embryo in the sac is this normal?

Still may be OK: It can be normal not to see a heartbeat until up to 6wks 5 days. the absolute earliest it can be detected is usually around 5w5d. The yolk sac is a good sign. Be patient and hopefully all will be fine. Keep making regular appt's with your OB dr. and ask them any questions. Best wishes.

Yes: This is normal at this stage. The embryo should become visible within a week or so.