Hello there.
I can understand your concern.
What do you want to do? Like do you want her to be
pregnant or not?
It's just been a couple of days since the 20th.
Sometimes the periods can be delayed for upto a month.
It can be delayed due to stress also.
Don't be tensed. Wait for a few more days.
Do a urine
pregnancy test after about two weeks if she doesn't still get periods.
Consult a gynaecologist for further help regarding this case.
Best regards.
Dr. Anil Kumar Jain.