Hi, I understand ytour query. In a woman in fertile age, having unprotected sex & slight bleeding 5 days before expected date of menses( provided it s going to be 22nd day this time )- The first possibility is conception with possibly implantation bleeding. Other possibilities include cervical erosion, polyp, pcod, thyroid or ovarian problems. * you should test blood HCG around youe mense date/ urine pregnancy test after 8 days of expected mense date. This will confirm pregnancy at an earlier date- allowing you for further management earlier. *If the test stands -ve, & the problem is repeated A gynecologist s consultation/ investigations are to be done to define the cause & needful treatment. Thanks.