hi, me and my girlfriend had protected sex for almost 4-5times n single nite (feb23), this s almost 2months back. But the following month and till now she has not yet got her period, her date s b/w 10th to 15th... we had a doubt whether she s pregnent or what so got checked by getting checking kit also, but the result found is NEGATIVE. she is really worried for not getting her periods, can i get an answer pls.......