 [ Symptoms ] could i be pregnant my period is a couple of days late i took a pregnancy test yesterday and it came out negative i last had sex on december 11th 2015 a couple of hours before my period started i did use the withdrawal method could i be pregnant also my periods are a bit irregular should i wait another week to retest [ Disease ] a bioidentical hormone is a hormone that is exactly the same as the hormones that you made when you were a menstruating woman so estradiol estriol are bioidentical hormones that you were making while you were menstruating and progesterone and testosterone all hormones that you were making i do not believe in synthetics i am not big on the synthetics because of the side effects