Can Vommiting After Protected Sex Be Symptom Of Pregnancy?

Okay so, I am a seventeen year old boy with a fifteen year old girlfriend. Have had sex nine times within two week. we use a condom everytime, but she is not on birthcontrol. She throw up yesterday morning and this morning. She hasn't missed her period yet, but I am still nervous that she could be pregnant. I also noticed during sex that she produced a very small amount to milky fluid (not semon i am positive). I have looked into abortions but from what i have read they seem to be rather dangerous. I love this girl with all my heart and when we are old enough i will marry her, but i dont need to have a child yet. From what i have said, do you think she could be pregnant?