Started Having Pressure On My Pelvic Area 2 Days Before

Started having pressure on my pelvic area 2 days before I was suppose to start(3/25), they last bout 45 mind to an hr and happened like 3 or 4 times a day. Then I started to get nauseated and waking up with bad headaches and been more muddy then usually and getting sick off certain food that I normally eat and massive weight gain in the past 2 months and on (3/29) I started to bleed but it's lighter then normal and it's bright red and looks watery. What could be wrong with me.