Hello,
This is Dr. Papaqako answering your question.
Thank you for posting to HCM.
From what you are describing looks very unlikely that your fiance to be pregnant. The fact that ejaculation have not happened during penetration, and the fact that she was under birth control pills, both lowers a lot the odds to be pregnant.
Also,
stress may delay the
menstruation in woman, and many other factors.
Anyway, if the delay continues, a
pregnancy test would confirm or Rule it our for sure. symptoms like
nausea, breast tenderness are also a sign of pregnancy, but they don't begin right away.
So, to summarize, I would not be much worried about a possible pregnancy, but doing a pregnancy test will tell it for sure if that is the case.
Let me know if you have any other query.
Take care.