Last month, my period was late. I had cramping in my lower belly and exhaustion--very bad mood. I had read that early pregnancy symptoms are like premenstrual symptoms and thought that I could be pregnant, but felt crappy and got neg results from 3 HPTs. I called my mom and she suggested that I take hot grean tea. If you are pregnant, the tea won't hurt the baby, but if you aren't then the tea would flush out your period. It's like an old herbal trick to get your flow going. I drank two mugs of hot tea then began getting my period. I had terrible cramps and a clump of dead blood came out. After that, I went on the finish my period and felt better.
So, short answer is, you could be pregnant or you could have just disrupted our flow somehow. Take hot tea and let us know how it goes.