Irregular period and low progesterone level

I've been on Clomid for 2 cycles now. After the first cycle, I was told that my progesterone level is only 0.7. After the second cycle with the double dose of Clomid (100mg), my progesterone level went down lower(0.4), and this time I was not even ovulating! The Dr told me she will triple dose the Clomid (150mg) on my next cycle, but I'm getting confused if that's the best thing? Why am I supposed to be on 3x dose Clomid when my progesterone level was going lower each time? Plus, my cycle is sooooo irregular... it only comes every 2 or 3 months or even longer sometimes. Is there any way they can regulate me first? If anybody has similar experiences, please let me know!