PT result delayed period

Mga mamshiesss Sana mahelp poo ako, amm June 12 pa Yong menstruation ko then nagpt ako this past few weeks then have my HCG blood test but it was all negative, Kaso Di padin ako dinadatnan so I tried to take PT again then ayon nagpositive Siya so to make sure Sana gumamit pako isang PT pero Yong ginaming Kong pangalawa nag negative na. Is it false positive Lang? May same case po ba dito thankyouuu