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You could be having urethritis or vaginal infection. Due to close proximity of female urethra to vagina, it gets easily infected, and irritated after intercourse. If the symptoms are persistent, and occurs each time you have intercourse, you should consider visiting your doctor/gynecologist at the earliest for examination, vaginal swab/smear test, urine analysis to look for the causative agent. Get started on treatment as appropriate (based on examination findings and investigations results). Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle. If infective cause is detected, get your partner also treated simultaneously, and avoid having intercourse while being on treatment to prevent chances of re-infection. Avoid vaginal douching, use of harsh soap or perfumes in the area. Use loose cotton undergarments and avoid use of tight fitting clothes. Avoid sweat accumulation in the area.
Take care.