False positive?

My cycle was due 10 days ago. I'm usually always every 27-28 days starting between 10a-12p....never had any issues! For the last 3 weeks I've been cramping, nausea, sore breast and extreme fatigue. My first two test (the day I was late and then 4 days later) were negative. However, I took two tests on day 8 and it was positive. Day 9, I noticed I started light bleeding (more than spotting) and it freaked me out, so I took another test and it was positive but a faint line. Today day 10, full on period and an even fainter line. What the heck is going on with my body!?