Delayed periods...plzzz need help...plzzzz

Am very much regular in my periods...till today haven't got delayed periods...i had intercourse with my bf 2 days just before my ovulation day...on the day when it was 11% high risk of pregnancy....i had protection with condoms...but he first entered in me without condom...now i have missed my period by 2 days which i generally dont...plzzz suggest what should i do...???