pcos and pregnancy, should i take any pills?

Hi,
Am 22 years old and have pcos. Previously my LH level was 17. My doctor prescribed diane 35 for 2 months. My LH level was 8.5 after taking diane 35. Now, am trying to get pregnant for past 2 months. i got my period on 8th of may. Then again i got slight bleeding like on 23rd for a week. It didnt seem like my usual period bleeding. I even took the pregnancy test, but the result was negative. Now, am confused with my period date. Is there any chances of getting pregnant or should i take any pills? Am taking only metformin as of now. Please suggest me.