Implantation bleeding?

Can implantation bleeding occur AFTER a faint positive test?! I’ve had faint lines on multiple brand tests for the past two days. But today I woke up to a small brown streak of blood on my pants. And when I wiped there was another small streak of brown blood. It’s been a couple of hours and I haven’t had any more. I’m 11 dpo and my period isn’t due for another 3-4 days... I’ve never been early before, but I guess there is a first for everything so I’m not ruling it out.

But I thought you’d have had to already implanted to be able to produce the hcg to get any kind of positive test? So can the blood take a few days to actually come out after implantation or is it generally at the same time? I’m so so confused and don’t know what to think right now. I know only time will tell. But if anyone has any insight or experience it would really help settle my mind. Thanks in advance xx