Blood pregnancy test??

A blood test taken sooner than 11dpo does have a significant failure rate, but if her blood test was done after her period was late, then it will have been reliable. So no, you can't be 2 months pregnant and have a negative blood test. The baby needs the hCG hormone is large numbers (in the thousands) and by the time she was 2 weeks along her levels should have been in the hundreds. However, if they did a Urine test in the hospital, that could easily have been wrong.