im 20 years old and i dont know if im pregnant.. i use thrice a pregnancy test diz month and the result is negative im not so sure if im pregnant ... and i hve my sex during my menstrual flow i dont know if it is safe or not... cn u pls help me bout this my problem bcoz diz tme i missed my period and im getting nervous i dont know wt shall i do.. tnx..! hope to answer regarding w/ my problem.. godbless more powers.. :-(