Hi Erin,
If you have taken pregnancy tests and they have come back negative, because you took the plan b, I would suggest you go to the dr's and get a blood pg test, just to be absolutely positive. Yes, you could be pregnant and not know it, you wouldn't start feeling any physical changes for another month or so, and some women do not get nausea or vomiting. It might just be stress that is delaying your period.
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Warmly,
Chase
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