The first and last time I had sex was October 3. Reused a condom and I just started my third period since. The two periods before this one started on the day they were supposed to and lasted 6 days each (which is normal for me), but they were lighter than normal. There too much blood for it to be implantation bleeding or spotting though. I started my third period today but it's 3 days early and it's way lighter than normal. For the longest time I had mucus in my throat and nausea (they started after I got my first period after the sex), but those symptoms have gone away now. It isn't possible for me to be pregnant, right? I'm too young for a kid and I'm just really anxious about this.