I'm about to turn 18 just joined the army so I'm really freaking out, if I'm pregnant this will for sure ruin my future. My boyfriend and I were extremely irresponsible this weekend and didn't use protection. My period was due about 3 days ago and no sign of it yet. I'm not sure though I'm hoping it may be a little late because I've been crazy emotional these past few days, crying and not knowing why the hell I'm crying then laughing about it when I stop. My question is how soon after conception would you have mood swings? Am I worrying over nothing?