Hi, I'm 13 days late and have had no signs of a period. I'm normally clockwork, never been late longer than a day. I've taken a few pregnancy tests ranging from a day late to 3 days ago. I've been nauseous, hormonal with mood swings, and had very light bleeding about 5 days after expected ovulation. That had only lasted a day or two. For the past week I've had very bad backaches. Could I be pregnant?