Hello,
You were using condom while having intercourse with your Gf and now she has missed her periods.
Pregnancy can occur if condom got torn and she was not on any regular
contraceptive pills and neither took any emergency CP. You are suggested to wait for a couple of days and then get your Gf pregnancy test done with the first morning mid stream urine if she doesn't get periods.
In case her pregnancy test comes positive, you should get her clinically examined by an
OBGYN so that she can be managed accordingly. In case, she is not pregnant, delay in menses can occur due to anemia, stress, poor general health, PCOS,
hormonal imbalances,
thyroid dysfunction, etc. Let her be examined & tests, investigations done. She will be treated accordingly. She should take adequate rest and take home made nutritious food.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Nupur K., General & Family Physician