Hey I'm 18 years old my name is selyna and I had unpretected sex on the 7th of August and I had my period on the 15th of july. My partner didn't cum inside of me but he pulled out and then put it back in after .. I took the morning after pill and I felt sick and through it up , I had it in my stomach for probably only 5-10 minuets . and its 6 days after and this app says I was supposed to have my period on the 11th and it is the 13th . I was a bit confused because I had my period on the 15th of the past 2 previous months . I've calculated how long the cycle was for June 15th - July 15th and it was 31 day cycle . but I had to of ovulated somtime this month . and usualy I feel breast tenderness 2 weeks prior to my period and I have no breast tenderness .. No cramps ..no lower back cramps. Witch is normal for me every month and that usually happens and that's how I know I'm going to start my period soon .. I need help ? I need someone to give me advice on this please ..