Surely one of you has had this experience or has an answer for me!?

Ok, I thought I ovulated around the 12th of this month when my cervix was soft and high and I had a small amount of EWCM, then my cervix returned to lower firmer more closed position. For the last few days later it was soft high and more closed with no EWCM. We went ahead and bd'd last night and then today I have been spotting. Is this my period or implantation from the 12th? I am so confused! I have had no more spotting. I have EXTREMELY irregular periods so this is why I have been tracking cervical position and mucus. (With extremely clean hands, so I don't need a lecture about that!) Thanks in advance for your advice!!