Weakly positive Her2

[Denvergirl]

My her2 result came back POSITIVE on my original biopsy but was in the low range. My Oncotype came back NEGATIVE for Her2. A repeat FISH assay came back POSITIVE (low end of range) for Her2 again. Then, I signed up for the ALLTO trial - they sent my tumor to the Mayo clinic and it came back NEGATIVE again for Her2. Should I be on Herceptin every 3 weeks for a year with my equivocal Her2 status? My doctor is recommending this . . . Thank you.