Implantation bleeding or ovulation ?

LiyZhaee

My last period started on November 29th and ended on December 3rd! I had sex on December 3rd , 8th & 17th ! And started spotting on December 18th which I only seen when I wiped myself .. and it stopped on December 19th ! Which is not normal for me because it has never happened to me before and I honestly just want to stay on the safe side ! Any suggestions , opinions or anything ?