Dark Yellow Vaginal Discharge: Causes and Treatment

It may be bacterial vaginosis, another common form of a vague infection. It is due to excessive bacterial growth in the vagina. You should see a gynecologist to determine the diagnosis and treatment. 

It is not recommended that you delay your periods as it can be harmful to your health. Attempts to control your menstrual cycle can result in hormonal disbalance and hence irregular periods. Talk to your gynecologist

After the intercourse if you had periods in March, April, and May, on March 5th, it's unlikely that you're pregnant, as regular periods suggest otherwise.

Not getting withdrawal blee­ding after taking the i-pill post protecte­d sex doesn't always mean pre­gnancy. The emerge­ncy contraceptive can sometime­s affect your menstrual cycle. Howe­ver, if you're still worried, you can take­ a home pregnancy test a fe­w weeks later to e­ase your mind.

Based on your menstrual cycle, you are approximately 4 weeks pregnant. The conception likely occurred around November 17th, the time you had intercourse . It's important to confirm your pregnancy with a medical professional and schedule regular prenatal visits. Taking prenatal vitamins and avoiding harmful substances like alcohol and tobacco can promote a HEALTHY pregnancy .

According to the dates you've given, it is improbable that pregnancy would result from the action on September 8th. As it was after your period, the probability of you becoming pregnant is not very high. The first indicators of pregnancy can be such as missed periods, nausea, fatigue, and breast tenderness. If you notice any of these symptoms, it is a good idea to take a pregnancy test to be sure.