My last period is on 5 February 2020 and I did sex on 5 day of my period i.e 10 February 2020 .I did unprotective sex but my partner said he didn't eject the semen into my vagina but I'm scared so I already taken I pill within 72 hours of sex .I take I pill on 12 February 2020 in the morning .after this I didn't want any unwanted pregnancy so I checked my urnie hcg level after 13 days of sex or intercourse but it shows negative result but today is 4 March 2020 my menstrual cycle didn't occur yet only cramps in my abdomen just like occur in periods time and vaginal spotting very little spots of bleeding is there chances of pregnancy should I checked again it and when should I checked so that I got accurate result