 [ Symptoms ] could i be pregnant i had sex with a friend 1 day before my fertile window my period ended may 13 and fertile window starts may 18 and i am 6 days late for my period and a took 2 pregnancy test on missed period day 3 and they was negative i felt like crap for a few days but i think it was because stress should i test again today [ Disease ] com it is mostly a hormonal disorder all metabolic disorders get your phosphorus calcium and parathyroid checked