Trying to stay positive but scared!!!

Never commented on here before but really need some advice from other moms that may have been through this. My last period was the 22nd of fed so i was calculating to be ariund 12 weeks now, but i went to my scan yesterday, which was pulled forward because im bleeding, to be told im only 6 weeks 3 days they cant find a heartbeat because its too early so iv got to go for another scan next week an hope they find a heartbeat. Has anyone else been in this situation as theyve told me to stay positive as everything could be ok but deep down im scared iv lost my baby!! Any advice would be truly appreciated.