Implantation bleed?

G

I was due on my period on the Friday 18th October and on Thursday and a bit of Friday I had the lightest pink spotting for a couple of hours. I had to insert a finger to really see any bleeding. This has totally stopped. I have taken a few tests before this and 2 in the past 2 days can, 3 days since the ‘bleeding ‘ stopped. Is there a chance I could be pregnant. My periods are regular and I never miss them and I’d had sex multiples times in the month.

Has anyone else ever experienced this where they spot for a day, test negative and later test positive. Thank you