early pregnancy test

hello i know every woman is different but I'm wondering when is the earliest anyone of you had a positive test even a faint line. i got pregnant last December and I was on vacation so I didn't test until I got back n by then my period was 3days late so I took a clearblue test and second later it said pregnant. I had a miscarriage back in the beginning of march. I bn trying since then. My doctor said to wait for two period before I start trying again but of course i didn't wait. I had two period I'm 8days away from my next period. And this month I pretty much had sex everyday around the time I was ovulate and take the tests. I got a positive for two different brand of ovulation test so I know I had sex at the right time. And I bn drinking geritol koz I see a lot of woman said there's a baby in every bottle. I just can't wait anymore I bn buying so much baby stuff but I'm scared that I might never get pregnant again or carry to term koz my family have a history but all my test came back normal but I'm still scared please help