Understanding Ultrasound Results & Potential Pregnancy - A Medical Explanation

Question
Hello doctor i am 14years old and am using no medicine.it has been four months since my last sexual intercourse with my BF.yesterday i had ultrasound because i was worried that i mightbe pregnant.ultrasound result says:"uterus is6.5cm in length and 2.5 cm in width.it has normal shape,contour and texture.uterine cavity is collapsed.endometrium meausres 02mm in thickness.ovaries are normal in shape & volume.no adnexal abnormality detected.there is no free fluid in the pelvis." so doctor i wanna know from u that does it mean that i am not pregnant and also tell me anything special about result.thank u very much in advance.

Answer
According to the sonogram, you are NOT PREGNANT. The description in the sonogram is of a normal size uterus, ovaries, and endometrial wall. You did not mention when the first day of your last period occurred. If you have a normal 28 day cycle (from the first day of your period until the first day of your next period) ovulation occurs on cycle day #14. YOu can ONLY become pregnant if you have sex on cycle day #13,14,15, or 16. If you miss a period, wait seven days and take a pregnancy test. However, at the age of 14, it is common to have some "anovulatory cycles" which cause you to miss your period from time to time without being pregnant. Don't worry. The sonogram was normal.