Hi dear, Thanks for the query. I have read your query & understood your concern. - Unprotected sex 2 days after normal periods .. has minimum chances of conception unless you have very short menstrual cycle ( 21- 24 days ). Any doubt can be cleared with HPT after 8 days delay in periods. - Post sex pain that lasts for 4 days,, suspects some inflammation in pelvic cavity ( it may involve vaginal or pelvic infamation/ bladder infection/ ovarian problem/ uterine fibroid/ hydrosalpings/ appendicitis ) You should try with - observe good vaginal hygiene . - drinking plenty of water, - NSAID pills over the counter taken after food twice a day. - carminative mixture / mild laxative in case of constipation. - In case there is no relief,consult a gynecologist for physical examination & some investigations ( Urine routine test/ high vaginal swab microscopic & culture test as per need / USG pelvis ) to pin point the cause followed by specific treatment. Thanks.