home pregnancy tests

Hello I am sorry to bother you but I need help... Yesterday Friday 19th may I took an HPT and it came back positive and I was so overjoyed as it would be my rainbow baby... Then just 10 minutes later I looked at it again but it was a negative, I don't know what this means and any advice would be such a huge help, Any suggestions would be a great help As I'm a little worried many thanks x