6 days late & faint positive

Hi,

I had what I think was implantation bleeding at 11dpo, it was watery pink and only when I wiped on and off, for around 5 days. I normally have medium/heavy periods and they are like clockwork every 27 days. I have been having ALOT of lower back pain and cramping around my lower abdomen, nausea too. Strangely my boobs are not sore, which they normally are. I had one VVVFL yesterday, but I think it might be an evap line.. has anyone else tested positive later than 6 days late, or 20dpo?

Thanks in advance 😊