My girlfriend and I had sex for the first time with a condom and I didn't ejaculate in September so 8 weeks ago. her period was late by a week and she had a normal one lasting five days, 2 weeks ago but this past week she's been getting nausea at night and she's been getting headaches and she even threw up a couple days ago, she's been getting mood swings as well could she be pregnant? I have mono could she be developing that instead? I'm 17 she's 16