Please please help?!!

Ok so I misscarried like 3 weeks ago and at the time that I found out I was pregnant my levels were low to begin with so my obgyn perscribe me progesterone. They worked for a little while And my levels had doubled then the next week I started bleeding a little more and my levels had dropped. I'm guessing my miscarriage was due from low progesterone levels. Can low progesterone levels cause miscarriages and has anybody had low progesterone levels and did not miscarry?!!!!????!!!