PCOS Complications while on Metformin, Implantation Bleeding, Or Pregnant?

Hello. I've been diagnosed with PCOS 10yrs ago. I have hairitsm, weight gain, unbalanced hormones, and multiple ovarian cysts. I was advised to take Metformin to better my chances for pregnacy. I would try to take the meds for about 3 days and stopped because of the side effects. I worked around too many people to be passing wind or being on the toilet on a consistent basis. Throughout the years, I've tried loosing weight, herbal-all natural meds (made me have a period but didn't correct my problem), and somewhat changed my eating habbits. My period would come for 3 months at a time consecutively, and then disappear for another 3 months. I would experience brown spotting from time to time during my off months. Last year, my old GYN told me I was "fully blown" PCOS- meaning the multiple cysts on my ovaries were large.. but he didn't do a blood test. I got married this year and my husband and I are TTC. I changed doctors. I work from home now (for the same company) so I started taking Metformin and prenatal vitamins towards the end of July. In August my current doctor advised me my blood test came back normal including my DHEA levels. I asked to him to do a total count of my testosterone because I still have hair growing on my face and shave like a man every other day. My blood results shows my total count of testosterone was still higher than normal but not as usual. My transvaginal ultrasound came back with me having a mild case of PCOS (only a few but very small cysts).. Finally, my period came down (heavy and clotty) on Sept 15th. I starting spotting brown on Oct 5th (still taking Metformin and prenatal vitamins) but this time I had a streak of blood too. I had an appointment with my Internal Med Dr the next day. I told her about the spotting and she advised me of Implantation Bleeding. She said to wait 2 weeks and take a preg test if my period don't come. I'm more concern with why I'm spotting brown while taking Metformin. 2 weeks didn't come yet... I have 4 more days.. lately, I've been cramping, notice my breast are a little bigger, urinating more, getting sleepy early. My cervical mucus is almost in like lumpy lotion. I'm anxious to know whether or not I'm pregnant or having PCOS complications.