Implantation bleeding? Ovulation bleeding ? Help !!!!

My cycle is 31 days my fertile window started CD 13 and ended CD 20 ..... I had sex everyday of my fertile window on CD18 or 19th after sex when I wiped there was a faint pink discharge only when I wiped the sex wasn't particularly rough and I'm not new to sex either this has never happened to me before I've read some where that it could be implantation bleeding ? But I'm sure that would be 2 soon then in read ovulation bleeding and I don't know if that is bad or good can anyone help ??? My period isn't due until July 19th that will b cd31 for me I believe or cd1? I'm new to tracking also I've had very light cramps so light might be in my imagination because I've Google ovulation bleeding symptoms lol