So I've had a confusing month and need some help! I'm on BC but may have been late on a pill in the beginning of the month but I'm not sure when. I had unprotected sex May 14,15,16,&19. On the 19th I started spotting brown and pink. I was convinced I was pregnant so I stopped taking my birth control May 21. After I stopped taking it I started bleeding very heavy so I began taking them again May 24 and the bleeding stopped May 25. I assumed I wasn't pregnant and took a test and got a BFN. It's been two weeks and AF was due three days ago. Three days ago I started having thick white discharge and last night I started lightly spotting brown. The spotting stayed brown and I'm pretty sure it has stopped. I experienced a BAD migraine the day before I began spotting, and the migraine ended around the same time the spotting started. After the migraine ended I had extreme diarrhea. I never get migraines and my diet has not changed. Could I be pregnant & experiencing implantation bleeding? Or is that impossible since I had breakthrough bleeding this month already?