My partner decided to try and conceive. On September 3rd I begin to spot brown. September 4th I had my IUD remove after my IUD removal I began to bleed for 3-4 days. After the bleeding was over I had unprotected sex September 13th (2nd or third fértil day) 3days later I began to spot light brown again for two days then it stopped. What can it be? Was the bleeding after the removal my regular period or was it from the IUD removal? Or can it be implantation bleeding?