hello doctor, m a 20 yr old girl , i m realy confused n scared weather i am pregnant or not. I had my last preriods on 18th feb. And its 23rd march and i am not down yet. I had intercourse with my guy on 4th amwd 11th march i.e; a week before my periods, without protection, but i am sure that he didnot ejaculate inside me at all. But i am scared as now i am almost 5 days late. What could be the possible reason and what should i do now?