welcome to hcm
as per your history you have a chance of pregnancy
if you are not on regular contraception
as the ovum comes for fertilization on 14th day of menstrual cycle and due to hormonal
variation its possible for few days this side and that side of ovulation day pregnancy.
better u take emergency contraception like i pill
available in market with in 72 hours of unprotected sex.so according to ur timing u can still take it to avoid future pregnancy related complications.
Dr. vikas poddar