I dont think that would be a good time to take a pregnancy test since 13 days before your period is probably around the time that you are ovulationg and it can take up to a week for the egg to implant in the uterus if implantation occured. Wait till the day you are supppossed to have your period, I know you are anticipating, but the best results are about 5 days past the day you were suppossed to get your period.
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