I had protected sex with my boyfriend 5 days ago. He ejaculated into the condom while inside of me. I was supposed to get my period the day after according to my iperiod app, which is usually correct, and am now 4 days late. I have been very stressed over the last few months with sister problems, but have not had a late period until now. Could I be pregnant? And my ovulation for my last cycle was the 26-31. I would prefer to not be pregnant but could I be?