Help! Super confused on these results!

Amy

Im 3 days away from my expected period and 9 dpo. I started bleeding today not necessarily period heavy but I’ve never had implantation bleeding before so not sure what that is like either. In the middle of the day I decided to take a test.. peed and got a positive took another test 30 mins later and it was negative.... what should I do? Any advice? Has this happened to anyone before??