Implantation, AF or Chemical pregnancy?

Hi all. I'd love to hear people's opinions on what's happening with me. Me and my husband started ttc again this cycle after having a miscarriage almost 3 months ago. I was feeling symptoms during the week similar to what I felt the last time I was pregnant. I waited until Saturday to take a test (3 days before AF due) there was maybe a vvfl but I didn't think much of it. I tested again Sunday morning and this time, though faint, there was a line. Then Sunday night I started bleeding. It was brown, some pink coloured blood too. I panicked straight away but hoped maybe it was implantation bleeding. The next morning I woke up and there was very little in my pad. It was there when I wiped, again mostly brown some pink tinged. I took another test and there was definite progression. It was still faint, but obvious to see when you look at the test and definitely darker than yesterday. A few hours later there was red blood with what looked to be some small clots when I wiped. I know clots are not present with implantation bleeding. It is all very light bleeding compared to a normal af and the last time I checked about an hour ago, it was even lighter and was back to the brown and pink colours. Actual af due tomorrow. Has anyone experienced something like this? Sorry for the very long post, I'm so scared and confused. TIA for any responses.