Panicking over scan

So on April 8th we found out we was pregnant after trying to conceive for 15 months, we was so over the moon at our 8 week scan to see a perfect little baby with a strong heartbeat. Then about 10 weeks I lost all my symptoms which at the time we thought was usual (FTM) so it was a huge shock at our 12 week scan to find out babys heart had stopped at 10 weeks. I would of been due on the 8th December and still so upset now. But we are now pregnant with our rainbow baby and so hoping everything's going to be okay. I'm now 11wks 4ds and symptoms are so strong constantly nauseous and got sore breasts, but our 12 week scan is on Wednesday and starting to freak out that we are going to loose baby, I can't sleep I'm that stressed. Just hoping everything's okay