advice

Is this implantation bleeding , I missed my period the entire month of August and I went to a hospital and had a pee stick test taken and I even took one myself and it was negative. I took one the 31st - negative then on the first I had light spotting after intercourse and I looked it up and it said “ consequently, during sex, vaginal mucus and semen can carry some of this implantation bleeding into the vagina , where you may notice some light spotting and bleeding” but then on the 2nd I got a negative test at the hospital… then on the 4th which was yesterday I got these light spotting which didn’t last even an hour , I put a pad on and nothing would be on it. so later that night I took a test and once again it was negative … I don’t know what I should do or what this is because I’m no longer spotting and I have extremely sore nipples. It’s almost like my last pregnancy only after implantation bleeding I got a positive like at 12am the next day. What are your thoughts ?