Thanks for you query.
I read your query and I understand your concerns.
Following is my reply:
1) The bleeding is likely due to trauma from fingers.
2) If possible get examined by a gynecologist to check if there are any wound or abrasion causing bleeding
I hope I answered your query. I will be available for any follow up query you have.
Dr. Mahesh Koregol
IVF & Infertility