Urinary tract infection occurred more often in the control group 10.5% vs. 17.1%, this finding was not significant (p=0.27). Nevertheless, urinary tract infection correlated negatively with CB2 expression (R Spearman -0.253, p=0.04). Bleeding reported by patients at any stage of pregnancy were statistically more frequently occurred in the study group 23.5% vs. 5,7% OR=5.06 (95%CI: 1.14 - 22.49) (p=0.01) and correlated negatively with CB2 receptor expression (R Spearman -0.236, p=0.012).