So me and my boyfriend had sex last month when I got off my period which was on the 26. I was riding him and he came once I got up the condom was halfway in me! His cum fell on him and I'm scared I got cum in me. I'm scared I might be pregnant because on this app it says I should've gotten my period on the 11. I started my period on the 20 of last month. What do I do? Is the app wrong? Or?? Please help!!