Should I get a second opinion?

Hello ladies,

I am typically very punctual with my cycles. At 4 weeks after missing my period I got a positive pregnancy test. At my 7 days - 3days I went for my first ultrasound, the baby measured 5 days 6 weeks with a hb of 106. As there was a big mismatch my doctor did hcg and progesterone levels and found they were both increasing. I was also given progesterone just in case.

Today, I had a follow up ultrasound, I should have been 7 weeks 4 days with the corrected due date or 9 days 1 weeks based on my last period. This time there was no hb and baby measured 6 weeks 3 days.

This is now my second miscarriage. Both in the 1st trimester. My doctor recommended ti take the pill as the pregnancy is no longer viable.

Should I get a second opinion? Is it possible that they made a mistake ?