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You may be experiencing symptoms of a vaginal infection. Talk to your gynecologist for a proper diagnosis and treatment plan. Using over-the-counter creams or medications without a proper diagnosis can worsen the condition.

The chances of getting pregnant from oral sex are quite low, but it is not ruled out. The bleeding you may have had after taking the unwanted 72 pill could, indeed, be attributed to the pill itself affecting your menstrual cycle. This can cause spotting or irregular bleeding. Such a thing is not a sign of ovulation bleeding. You can experience a late or early period as well as any of the above. The important thing is to monitor the symptoms enough and give enough time. Recall the pill can throw off your cycle. If you are concerned, be patient, and take a pregnancy test to make sure. Avoid stressing out, because stress can also be why your periods are irregular. 

Menstrual cycles are not only affected by pregnancy. There can be many reasons causing irregular periods including stress, weight changes, hormonal imbalance and even underlying medical conditions. It is advised that you seek a gynecologist's help to get a proper diagnosis and treatment.

There's a chance you have a yeast infection. Itching, redness, swelling, and a burning sensation are some of the symptoms. It smells bad because of this reason. So yeast infections are a result of a build-up of yeast in the vagina. The usage of antifungal creams that can be bought at the drugstore would also be beneficial to solve it. 

It is best to visit a gynecologist who specializes in reproductive health to properly diagnose and treat any potential complications.