Implantation or period?

So af was due the 4th. Today I got this twice and that's it. I took a dollar tree pregnancy test today in the middle of the day bfn. But like 3 days ago I got a faint positive on a first response. Faint but for sure there. I dont know what to think. And don't say get a blood test because where I live you can't until you're 3 weeks late. 

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