Four months ago my Boyfriend fingered me and I'm afraid that he has semen on his fingers so within 23 hours I took a postinor 2 according to the directions and I had withdrawal bleeding for four days 7 days after taking the pills. And after 28 days I had another bleeding which I considered my period. After that he fingered me once more and I was afraid that there was semen again but I don't think there was. I had three regular periods since then and I haven't had any symptoms but my last period came one week early and I took two pregnancy test three months after the incident and they both came out negative. Is it possible that I can be pregnant as I am paranoid