Hi Questionsinnyc, I thought I replied to this, but evidently I accidentally closed that window*
The discharge you have described (in combination with your period) sounds like what is expected after a colpo + biopsy/ECC. The doctors probably applied a solution that, when mixed with blood, appears black/grey/silver upon discharge. It stops the bleeding from any tissue sampling they did during the procedure. That discharge can last 7-10 days.
Have you received the results of the biopsy? The doctors office usually has the results back in 4-6 business days. I usually call to get the results, rather than wait until my follow up appointment. I'm just too anxious.
You will need the results of the pathology report from your colpo/ECC if you go to someone else, so I suggest you hear what your doctor has to say, then decide.
Based on what you've said, I'd suggest you book a second opinion (for some time after your follow up appointment). Your doctor may be right, that it is related to the BC pills, but it would be comforting to hear another view point, I'm sure.
I hope that helps! Write back when you can!
*= hubby distracted me with a link to the story of the baby otter that was found in the UK and has a webcam!