Hello Doctor. I Have A Question Regarding Pregnancy. My Girlfriend

Hello doctor. I have a question regarding pregnancy. My girlfriend and I had unprotected sex on the 17th of this month. I did not reach climax while I was inside her therefore I can conclude that I did not ejaculate while "it" was inside. I did however feel something come out of me while I was withdrawing but I wasn't sure if it was my semen or pre ejaculate. Out of fear that she might get pregant, I searched online and came across the "morning after pill"(Nordette). I wasn't able to buy nordette due to unavailability but I was able to buy a generic form of it. I made her take 4 pills on the 18th and after 12 hours I made her take another 4 following the instructions I read online. She felt nauseous after the second dose and I read that nausea and vomiting was one of its side effects so we simply waited for it to subside.
Yesterday, 29th of this month, she told me she was feeling nauseous and she was "feeling sick", having a headache and slight fever. Could this mean she is pregnant?