Hi doctor, I had protected sex four days ago , I...

Dear Customer
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Is it possible that you got pregnant ?
according to the info you have mentioned , its not possible to be pregnant in this case 
Then what is the cause of your medical condition ?
the main cause in your medical condition is hormonal imbalance which lead to delayed period , and by taking medications hormonal imbalance may increase as well ( as an OCP side effect ) 
What to do next :
1. stick to your doctor instructions 
2. keeping taking the medication as doctor prescribed 
What if your medical condition presisted , What to do  ?
1. avoid stress  and have plenty of rest 
2. healthy life style including health diet and regular exercise 
3. have a home pregnancy test in the first week of the next period 
5. consult GYN doctor to do the needed routine medical test and determine the treatment pathways ( if needed ) 
6. in case of hormonal changes , doctor may prescribe medication to correct hormones imbalance such as duphaston , which you should take a pill every 12 hours for 5 days  
5. in case of thriod hormone abnormalties ( usually accompanied with other symtpoms ) , doctor will prescribe medication such as Levothyroxine
6. in case of other chronic disease such as ovarian cyst ( PCOS ) or other disease , doctor may need addvanced examnation to determine the causes and treatment pathway 
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Kind Regards