Could it be implantation bleeding ?

Ok so Friday night on December 27 I had some very light spotting my AF want due till Monday December 30 but I had sought cramping Friday night nothing bad though like I usually have with AF and usually I don’t spot before AF I just start bleeding lightly and then heavy for about 3 days then another day or Two of light bleeding. Well anyways I spotted slightly Friday night. Then Saturday woke up and had pinkish type discharge only when I wiped but it was bright pink and a good amount more then spotting but not enough to wear a pad or nothing. And then by Saturday night it was pinkish with maybe a light red orangish color that I put a pad on with but it barely filled it up and then Sunday it was a little heavier I had used a few pads that day and it was a little more red then pink this day but still not super heavy and still no cramping just kind of a dull achey pulling pain barely anything really pain wise. It basically was nothing like a normal AF and I figured since it was getting heavier even though it still never got heavy really I thought well must be AF coming early and would get heavier. But by Monday morning when AF was due anyway on December 30th it had stopped. Not a spot of nothing and nothing since. I thought well maybe it was a weird short early AF but yesterday I started getting sore breast and feeling naseus and I thought that was so backwards usually I’d have that before AF not after?! So I took a cheap pregnancy test from dollar store thinking I didn’t want to waste any money because I probably wasn’t pregnant since I did bleed. But I ended up getting a faint positive it was clear enough not to be a squinter but still faint and so anyways my question is could that have been implantation bleeding that late into my cycle and if so then why wouldn’t my line be darker on my test? Or could I have had a chemical pregnancy or something and the bleeding was me losing it and that caused the early bleeding and the faint positive? Anyone had a similar experience? Thanks for any advice or suggestions, I really appreciate it. I still am having what I feel to be pregnancy symptoms I’ve been very sick on my stomach and my boobs are very sore. Should I make retest with a better test? I mean my periods are never that short or light and I had no clots and no cramping really and it definitely wasn’t a regular period if that’s what it was. I really figure I was out this month but after looking back and thinking about it and feeling how I do now I started wondering if maybe it was possibly implantation bleeding 🤷🏼‍♀️