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When you start taking the contraceptive pill, there’s something you should know: it won’t protect you right away. It takes about seven days to start working. While you’re waiting for it to kick in, make sure to use an extra form of protection such as condoms so that pregnancy doesn’t occur. Some people may get mild side effects like headaches or feeling sick when they first try this type of birth control but these usually go away with time if taken properly. 

You probably have a yeast infection. Yeast infections may be characterized by vaginitis and such symptoms as itchiness, pain, and discharge (whitish color, worm-like) in the vagina. On the bright side, yeast infections are common and can be easily treated with over-the-counter antifungal creams or tablets. It is necessary to avoid using sweet-scented products and wear cotton underwear to assist in the prevention of future infections.

You didn't mention the pregnancy test and also even if it is possitive, you need to see your gynecologist. They can ask for some tests and confirm about pregnancy or any other health conditions
 

Hormone shifts, stress, and pre­gnancy can also cause this. Signs include a skipped pe­riod, feeling queasy, and sore­ breasts. To confirm pregnancy, take a te­st. Using protection helps avoid unwanted pre­gnancies and STIs too.