Help with how many weeks pregnant!

in Pregnancy
Hi Ladies! I got a strong BFP last night, but need a little help with figuring out my due date! So I came off of birth control on September 27th, and started having withdrawal bleeding two days later. I then had some very light bleeding for three days starting Oct 23rd—at the time I suspected it could be implantation bleeding, but it also could have been a period, so I’m not 100% sure on that. Usually my periods are more like 5 days, so 3 days just felt a bit short, and it also came a bit earlier than I expected.
I took a few pregnancy tests a week after my light bleeding, and was getting some faint lines that I wasn’t sure if they were faint positives or just indent lines, so I went to get a blood pregnancy test done. The test said that I had 2.5 HCG levels, which wasn’t quite enough to be considered pregnant, so I assumed that I wasn’t.
Oct. 25th was the day of my last bleeding, so I tested last night since I was a few days late, and got a super strong BFP! It showed up after about 15 seconds as the darkest line you can probably get, which I was kind of surprised by, since I calculated I would have only been about 1 day late with my period!
So my question is: do y’all think that the light bleeding I had for 3 days on Oct 23rd still could have been implantation bleeding, or was it most likely just a light period? So I’m either about 3-4 weeks along, or I’m more like 7-8 weeks along depending on which it was!
Thank you so much in advance for your help on this! Sorry for the long post, just wanted to be as detailed as possible!
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