More questions about implantation bleeding!

Hi! I posted about this yesterday, but I have more questions! So I took pregnancy tests at 9 and 10 DPO. Both completely negative, no trace of a line. Then at 11 DPO, I got what I thought was my period. It was light to medium flow, but only lasted about 30 hours. And it wasn’t a consistent flow the whole time. Since my “period” was so short, I took a pregnancy test at 13 DPO. It was positive.

Called the doctor’s office, and a nurse told me it was probably not viable because of the bleeding. She sent me for a blood test but said she expected the results to be less than 5 HCG. I don’t get the results until Monday or Tuesday.

I took two tests this morning, 14 DPO, and they were both still positive! What do you guys think? Could I still be pregnant? If I bled three days ago, would the HCG still be in my system giving me positive tests? I’m so confused about all this.