My fiancée and I recently had unprotected sex sometime between Christmas and New Years. I have irregular periods so it's really hard to keep track, but I do remember I'd just ended my two week long menstrual cycle about two days before. The day after we had sex, I began to have spotting which went on for about a week and a half. For the past week or so I've been feeling really nauseous for most of the day, I've been getting backaches and headaches, a really bothersome shortness of breath and no matter how much I sleep I feel like it's just not enough. I also noticed I've been urinating more often, and two days ago I became constipated. Also noticed vaginal discharge that looks like a milky white. I know a lot of signs point to the fact that I could be pregnant, but I'm having my doubts because I was spotting for so long and it began so soon after we had sex. Any opinions?