Does this sound like implantation bleeding ?

Maria
Hey guys,
I had unprotected sex on the 17th day of my cycle (I have a 30 day cycle) and 6 days later I noticed a tiny bit of brown on my toilet paper when I wiped. I put a q tip up there and there was some very light brown blood on it. I thought it was my period but nothing actually came out on my underwear. And also the day before this sporting, my pms symptoms completely stopped. My period is due in 5 days and apart from fatigue I have no other symptoms. 

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