What Could Cause Vomiting And Feverish After An Unprotected Sex?

My girl friend was not a virgin when she started the affair with me. And we had sex one day four times but on that day as far as I remember I didn't put my sperms in. But a week after I did it (sperms in) and I told her that. Then she got scared because it was after four days of her menses. We had sex in midnight and next day around 21:00hrs I gave her Yasmin pill to continue for 21 days. Next day she had the pill after b'fast and on the next two days she had after dinner. Next day morning she vomited twice and she felt like she's not fit to work. And she got flu as well.

And the important thing is two months before she vomited twice and she had this same feeling which she wasn't fit to work. And I went to the doctor with her and she had fever according to the symptoms. The day before I had sex with her for the last time (The day I put sperms in) she felt she's getting fever and after sex on the next day fever was gone.

Now I'm concerned of if she's pregnant or she's about to get fever again. She's scared to go and see a doctor. Can you help me on this as soon as possible? And we never consult a doctor on this case.