Home test positive/blood test negative

My sister did a home pregnancy test and it came back positive. Then she went into the clinic and had a pregnancy test done so that she could make an appointment to see her doctor. They did a blood pregnancy test and it came back negative. She had been pregnant about 2 years ago and the baby didn't make it due to the brain not forming. Since then she's been pregnant twice both ending in miscarrages.  Basically I'm wondering if there is any chance she could be pregnant? Why would the home test show up positive and the blood test negative?

[bam1014]

There is definitely a chance she is still pg.  I have seen a few posts on here of that happening and the ladies were indeed pg.  I don't know what would make that happen, but she should continue to take care of herself and still see if she gets positive HPT's.

[steph9803]

How long was it between her BFP and the bloodwork?

[ArmyPrincess819]

I'm so sorry for your sister's loss. She could be pg but also false pos's are more common than we think. She may have had a chemical pg. When was her period due? If the hpt was pos then the hcg would show up in her blood. She can always have her blood re drawn. Tell her good luck and best wishes. Take care!