Recetly I Got Married, And I Had Sex During The

Recetly i got married, and i had sex during the time my wife got blood. We thought that shed had losed her verginity. Then second time when we met together we had sex for so many times but for very first time she bleed and next she didnt. These happen for the third time too. When ever we had sex after so many days for first time bleed and rest she didnt. Can you please tell me why this happens??