Pcos and periods. Upt in july end -ve) ?

I have history of pcos. Got my hormones checked which showed increased LH and decreased progesterone in December and my doctor told me to have progesterone tablets 1od for 1 month. But then after 10 days i had continuous bleeding and my doctor told me to strop progesterone. I did. But still my bleeding would not stop. I had some medicine to stop the bleeding after 20 days of continuous bleeding. Next month ( January) till end periods did not came, had meprate 1bd/5days. Got withdrawal bleeding. Had unprotected intercourse in mid-February, had ipill (checked upt: negative), got withdrawal bleeding. Had meprate again in march, got withdrawal bleeding. At may-end had unprotected intercourse, had ipill (checked upt: negative). In june end had meprate again (upt: negative). It's August and no natural periods till now and feeling of nausea from past 1 week. Why no natural periods since December? And now nausea? Pregnancy now(even upt in july end -ve)?