Am 30yrs in my high chance of getting preg had my first unprotected sex around 1:45am and took plan b (lydia) around 7:45pm. have tested negative for blood pregnancy test and my period is delayed for 9days now. am really worried please?

Plan B ?'s: Even if your menstrual cycle is fairly regular, stress (work, school, etc.) will sometimes delay ovulation, which in turn delays the next menstrual event. A "blood pregnancy test" measures HCG, and it is very accurate. If your period does not occur in the next week, repeat the blood pregnancy test, and if negative, see your gyn for further testing.