Why am I missing periods?

Taking emergency contraceptive pill after unprotected sex may lead to the changes in the menstrual cycle including irregular bleeding. Yet, bleeding within a week of taking an i-pill could also be a sign of hormonal imbalance or other medical conditions. However, the best option is a detailed examination and treatment by a gynecologist.
 

Getting vaccinate­d during pregnancy shields both mother and child from te­tanus. The tetanus toxoid injection typically occurs in months se­ven or eight. Even if de­layed till nine months, it remains worthwhile­. Tetanus results from soil-dwelling bacte­ria. This shot fortifies the immune syste­m against that microbe.

Taking special medicine can delay monthly cycles. A prescription called "norethindrone" can temporarily stop periods. However, self-medicating poses risks of side effects. If rescheduling your period is necessary, always consult with your doctor first. They will prescribe the medication correctly and explain its usage based on your cycle details. Sharing the date of your last period helps ensure accurate medical guidance.

The doctor ordered this radiological test to check for any abnormalities, such as polyps or cancer, which might be causing post-menopausal bleeding. Endometrial hyperplasia, a condition where the uterine lining becomes thickened, may or may not involve atypical (abnormal) cells. If MRI and TVS reports show no pathological abnormalities, progesterone therapy may be recommended as a non-surgical treatment option. 

If you had faint positive pregnancy test results and the ultrasound did not detect a pregnancy in the uterus, it's possible that the pregnancy did not progress or was very early on. So the bleeding could also be due to hormonal imbalances or other factors. Check with a gynecologist to be rest assured