Hello
Thanks for query .
Based o the facts that you have posted you had sex 3 days ago which is followed by urinary symptoms like burning urination ,urgency ,frequency etc.
As regard your query about
STD ,You have not mentioned whether you has protected sex or unprotected sex .
Normally risk of getting STD is very high if one has unprotected and unsafe sex . With STD one has urinary symptoms associated with urethral discharge .
.All the symptoms that you have strongly suggest
UTI .
Please get your routine urine test and urine culture done to find out the organisms causing this infection and antibiotics to which they are sensitive to.
Please take broad spectrum antibiotics like
Cefixime along with urinary antiseptic like
Nitrofurantoin twice daily and urine alkalizer thrice daily .Later on switch on to appropriate antibiotics as per culture report.
Get the prescription of medicines from your family Physician.
Ensure to drink more water .To keep your urine dilute This will help to control
dysuria.
Dr.Patil.