Hello, I Am TTC And I Have All Symptoms Of

Hello, I am TTC and I have all symptoms of being pregnant but I have yet to get a positive. I am still 4 days away from my period but I am seeing white flakes in my urine, like some type of tissue. I had a miss carriage last month and saw the same white flake in my urine before and after my miscarriage. Can this be a sign of low progesterone?

Thank you.