Hi! My name is Chrislyn

About a week ago, last thursday to be exact, I started what I thought was my period early. It was light brown with some red spots and only lasted a day. My period was actually due yesterday and since then nothing. I have sometimes started my period with some spotting a day or so before my period actually starts but it should have started up full blown by now. I took a test the day after the spotting stopped but it was negative. Is it possible that I could be pregnant and just tested too early? I'm also experiencing sore and larger than normal boobs and I'm really tired and wore out. What do you think?