Observed differences, in terms of p-value as well as not significant (ns) p-value, in each time comparison for steroids and estrogens quantified by Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS) analyses. First Trimester versus Second Trimester: T1 vs. T2; Second Trimester versus Third Trimester: T2 vs. T3; First Trimester versus Third Trimester: T1 vs. T3; First Trimester versus Post-Partum: T1 vs. P-P; Second Trimester versus Post-Partum: T2 vs. P-P; Third Trimester versus Post-Partum: T3 vs. P-P; Data were obtained by the Kruskal-Wallis test and Dunns’ post hoc test. CORT: Cortisol; CCONE: Corticosterone; 11-DECOL: 11-Deoxycortysol; ADIONE: 4-Androstene-3,17-dione; TESTO: Testosterone; 17-OHP: 17α-hydroxyprogesterone; PROG: Progesterone; E2: Estradiol; E1: Estrone.