Not feeling anything from 8 weeks on

I'm 8 weeks and 6 days pregnant and the past couple of days I haven't felt anything. Up until then I was experiencing sickness, extremely tired and emotional and also my breast were sore. Then all of that stopped. I have been poorly with a chesty cough/pains in the chest and snotty nose so I am scared something has happened to the baby.. Is it normal for the symptoms to stop altogether like this? We still have 4 weeks to wait until our hospital scan so I have arranged a private scan for next week. I'm so scared they will tell me there is no heart beat.