Af or implantation?

I think I might be pregnant and I really cannot afford to be right now and it's stressing me out so I need other people's opinions to maybe help me feel better. I had sex about 2 weeks ago (during fertile week and condom was used) for the first time in 6 months. AF was suppose to the 30th but came Wednesday night or so I thought. It's usually really heavy the first day but it wasn't and it's been mostly old blood it's light and not normal. I've read on here about implantation bleeding and everyone says 6-12 days after and it started exactly 12 days after. I've been really emotional and stressed so do you think it's af or implantation?

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