TTC could I be pregnant?

Chelsea
I'm 20 days "late" but I have irregulars periods anyways. But I had all my PMS symptoms about 2 weeks ago but never got my period. I took a test Jan 8 and got a negative. Is it possible that I took it to early? My sister keeps telling me that I'm pregnant (she is 36 weeks) and apparently I had "the dream".... What would you suggest?

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