Doctor said hcg level is considered not pregnant

bl

At 3 weeks 4 day i got blood test done. My beta came back at 21. My doctor said it has to be 25 or higher to be considered pregnant. I know i definitely am pregnant due to multiple pregnancy tests. She said she knows im pregnant also but she cant put it in my file until my next beta is higher. I thought it was anything above 5 is pregnant not 25.