Talk to Gynecologist on Baby Missing

I was okay before getting birth to three child but now I am suffering repeatedly from pregnancy missing, usually between 35 - 50th day my pregnancy are missing, according to the doctor there is no germ etc, all the hormonal blood and urine tests are okay, I shared my voice anyone who could consult me or couod refers me to specialist I would be very thankful. because it will cause a mental problem, I need your hand plaese