I Saw My Last Menstrual Period On The 6-10th Of

I saw my last menstrual period on the 6-10th of May. I had protected sex but wasn't convinced about the safety on the 13th day of April and so i took postinor2 immediately after the sex and on the following day i.e. on the 14th. I bleeded on the 14th later that evening and it lasted to the 16th day of April. Is the bleeding normal? When am I likely to see my next period?