Hi. I Had Unprotected Last Two Weeks (not Sure Of

Hi. I had unprotected last two weeks (not sure of the date) and he came in me. Took postinor 2 within an hour. I experienced reactions on my face. Now two weeks after my nipples have been so painful; usually that's a sign that I'm seeing my period soon but its been almost a week and they're still painful and still no period. Please help