When discussing the menstrual cycle, it is imperative that you present data regarding your last menstrual date, cycle regularity/irregularity, and your cycle's duration (if it is regular). The pregnancy test you’ve taken is not valid because you performed it more than 5 days before your period was to arrive. Further, if you are experiencing actual menstruation, it is most likely that you are not pregnant. Nonetheless, if you take a pregnancy test and it shows up positive... then you are most likely pregnant and not experiencing menstruation (period) but, rather, vaginal spotting. The “periods” you’ve had during previous pregnancies (no matter how similar they appeared to real periods) were not actual periods (menstruations) but were probably spotting.