Low progesterone levels!!!!

Soooo I've been TTC for nearly 2 years. 2 months ago doctor put me on 50mg of chlomid and didn't bring my levels up at all. This past month 100mg of chlomid and only brought level up to 5.4 . Doctor said that it needs to be at 10.0 to get pregnant. Does anyone else have these problems??? And has anyone gotten pregnant with low levels??? I don't know anyone else with love progesterone so I just don't know how normal this is?????