So I started my period on dec 22nd and it was a normal 4-5 day period for me. But then, I started what I think is my period on Jan 7th. It was a darker brownish/red color, and very heavy!! Ive read about implantation bleeding, but im not sure that this was. Plus, I only bled for 3 days, and then stopped for 2 days, and then started spotting again for 2 days. Generally, my period is normal flow for 3-4 days, and then stops for 1 day, and then i spot for 1 day. It is now jan 18th and I feel crampy. My stomach is making this weird girgling sound for the last two days, even after I eat, I feel hungry. Im very tired, even after getting 8 hours of sleep, Ive had mysterious headaches when i'm waking up, and my boobs are sore on the sides. With all of this in mind, I took a pregnancy test this morning with my first urine, and it negative?!?!?! I dont know what is going on. Please help!!!