Thanks for the query.
Delay in periods can occur due to many causes.
If she had unprotected intercourse
around the time of ovulation, then there is possibility of pregnancy
But usually urine pregnancy test kit can detect the pregnancy after one week of missed period.
Sometimes due to low beta hcg
levels that may not detect in early weeks.
So let her go for blood test
for pregnancy once.
If the test comes negative, the possibility of pregnancy is less.
And she can take tablets to induce withdrawal bleeding with your doctor's advice.
If test comes positive, you consult gynecologist, get examined and go for ultrasound
Then depending on the findings you can proceed further.