Hi Sir, I'm 25 years old female virgin. Exactly 48 days ago (Last month) me and my bf had sexual incident. There was no penetration at all. He did place his penis on my vagina but he ejaculated no where near my body. After 10 days I had my regular period for 7 days. I have had timely period for about a years. But this month my period didn't start on time. One week has gone but no sign of period. Should I worry? Please let me know soon.