I will finished my pills on aug 7 and my bf want...

Dear Customer
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Are diane pills effective in preventing pregnanacy ?
if you took in the right order , diane pills are highly effective in preventing pregnancy ( reach to 99.6 % ) 
Can you take another pack of diane pills ?
no , you have to take in the first day of period ( first day of bleeding ) 
What are Diane side effect ?
1. period irrgularties
2. headache 
3. changes in mood 
4. abdominal pain
5. nausea and vomiting
6. general weakness
7. breast pain
How to use OCP ( Diane 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 is the possible cause of delayed period ?
period irrgularties is a common side effects on ocp pills , if your period delayed more than 1 week , reconsult your OBGYN doctor 
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Kind Regards