About a week ago, my boyfriend and I were having fry sex. Well it was sort of. I had underwear on, but he did not. My period was due today and I haven't got it. I have no cramps, and I'm worried. He did not ejaculate, but could I be pregnant from pre cum? There was no genital contact, but he didn't have underwear or a condom on. I'm really worried, please help!