If I take my contraceptive pills in wrong way or I...

How to use OCP ( oral contraceptive pills ) ? how to take ocp 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 
What to do if i forget my dose today ?
in case of forgeting 1 dose , take it as soon as possible , unless its almost the next dose time , then just take double dose
Is it still possible to get pregnant in this case ?
its highly unlikely if the case is only one time , so you need to worry 
What are OCP medications side effect ?
1. period irrgularties
2. headache 
3. changes in mood 
4. abdominal pain
5. nausea and vomiting
6. general weakness
7. breast pain