If i stopped drinking a pills for 1 week and...

Is possible to get pregnant in this case ?
yes , its possible especially if you have sexual intercourse during ovulation duration 
What to do in this case ?
continue taking OCP pills for the time being , and take blood pregnancy test after 25th day of the pregnancy 
- in such a case in the future , you need to use different method to avoid pregnancy such as condoms and avoiding ovulations days
- start a new pack of OCP with the start of the new period 
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 
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 )