Blood Pressure

I monitor my BP at home and it has never been over 120/80 which is my normal BP when not pregnant but every time I go to the doc it's high (for me). Today was my 32 week check up and it was 138/88. So I took it 3 times as soon as I got home and it was 104/75, 97/70 and 94/73. On the low side bc I haven't eaten anything yet today. I just don't understand how there is such a big difference. My husband has high BP and monitors his at home and it corresponds with his doctor. I don't feel nervous or anxious at the doctor so why does their machine run so much higher? Does anyone else have this issue? My doctor isn't concerned. It's just seems weird to me and I wonder if people get diagnosed with hypertension when they don't really have it.🤔