How long can it take to get a positive pregnancy test?

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I took a pregnancy test and it was negative. My period is 10 days late and its been about 3 weeks since I had sex. I saw online where sometimes it can take a long while.

I’ll be keeping my eye on this question, im a week late & have never been late before apart from when i was pregnant with my son.. ive also had negative results, and still no period. good luck on finding out. x
At 10 days late a negative result is most likely accurate. tests can take a while to turn positive when you test BEFORE your period is due or maybe on the day its due it might still not be positive or might be faint.. but at over a week late, it would be positive by now.