17th July I Had My Last Period And Then On

17th July I had my last period and then on 1st August I was engaged in sexual activity with my partner. We didn't have sexual intercourse.we just went till base 3. But then for safety I had an ipill after 2 days. And I yet haven't got my period . It has been around 1 month 15 days since my last period on 17th July. Also my period cycle is 22 days and not 30 days . I am really worried . Is there any problem ?