After my period I drink pills am I still ...

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Is taking OCP in this way is protective from pregnancy ?
taking ocp in this way may effect its effeciency , as ocp should be taken in its instructed way 
How to use OCP ( oral contraceptive pills ) ?
1. consult an OBGYN doctor to choose the best medication for you
2. OCP medication used by the first day of period , and its usually should be used for first 21 days of your period or as instructions 
3. you should take the pill in the same time every day 
in case of forgeting 1 dose , take it as soon as possible , unless its almost the next dose time , then just take the next dose ( dont take 2 pills in the same day ) 
What are the side effects of those medications ( ocp side effects ) ?
1. period irrgularties
2. headache 
3. changes in mood 
4. abdominal pain
5. nausea and vomiting
6. general weakness
7. breast pain
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