Advice??

Nikki

So I have a gut feeling I'm pregnant. I'm only 10 dpo and am still getting negative tests. My question is, at what point will a blood test show postive? I've had 3 miscarriages because my body doesn't produce progesterone so if I'm pregnant I'm afraid by the time a pee test will show, it will be too late. When will the doctor do a blood test for you? Would it be my obgyn or my primary?