Another girl worried about being pregnant xD

I don't like freaking myself out, and normally when I start researching or asking about this I start my period. But, as far as I'm concerned my period is late. By almost a week. So not too bad. Anyways, I've had extremely sensitive nipples, overly emotional (I've been crying about everything) I've had headaches, been very tired even if I take a nap, last week I noticed a lot of white on my panties, like I was ovulating but more. And this morning I could have sworn I started, so I jumped up and ran to the restroom. I'm cramping really really bad, feel extremely bloated and have extreme lower back pain. All signs of starting for me, yet no blood. Any one have any ideas? I don't want to get excited, I just want to know what it sounds like to someone who has had a little more experience in the pregnancy department. :P