You should test when your period is at least 2 weeks late, then test using first morning urine.
Experts say that all urine pregnancy tests are the same, so it shouldn't matter which one you buy. If you can only afford a dollar store one, I'd buy a few, test a few days apart, always with first morning urine. I've had friends that used the dollar store tests and had no complaints. Me, I always went for the more pricey ones, because I thought you got what you paid for, but really, they're all the same, they test the same way, so unless a test is faulty (which there's more of a risk with when using dollar store merchandise of any kind), it should be okay. This is really about your preference.
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