Possible implantation bleeding ?

Amanda

My predicted peak of ovulation was October 4th, i had unprotected sex on October 3rd and had taken an emergency contraceptive. On October 10th-13th i experienced light spotting/bleeding that varied from darkish brown to lightish pink in my discharge. I’ve never experienced any spotting or bleeding before my period. My estimated start of my period was today (October 20th), yesterday (October 19th) i had began lightly spotting/bleeding again. I thought it was potentially my period but the blood is not enough to fill a tampon throughout the day and i did not bleed throughout the night. Has anyone ever experienced this or possibly know what this could be or mean ? Please help, I’m really confused and concerned.