I need someone's advise. I'll be 16 in three months. Me and my boyfriend had unprotected sex October 21st and I wa supposed to strt October 27th but I'm now 6 days late. This has happened before when I first lost my virginity, and I'm not having any signs of being pregnant, and I'm not always starting on the exact day I'm supposed to, but I hve been EXTREMELY stressed lately. Any ideas on why this could be?