Hello dear
I understand your concern
Do not worry.
Chance of
pregnancy in your case is extremely rare.
Non penetrative sex does not cause pregnancy.
But if precum may touch the vaginal opening then pregnancy is possible.
Again pregnancy chance is nil if you did sex during safe period of cycle.
I would suggest to go for urine pregnancy test to confirm pregnancy.
It will come negative then no chance of pregnancy.
In absence of pregnancy, it could be due to
hormonal imbalance, excessive
stress, and change in life style & dietary habit.
If period will not come in next 7 days then drugs containing
progesterone by consulting gynecologist will help to induce period.
Meanwhile avoid stress, take healthy diet, drink plenty of water and do regular exercise
Best regards
Dr. Sagar