Am i pregnant or what could it be.? Help plz?

Im 18.nd im sexually active. Ive been very regular. But ive been 4weeks late. I took a test bout 3 week ago(night) nd i didnt wait 3 full minutes. I looked at it rite away nd said (-) so i put it bak in box nd went to bed so next morning i took it out again nd said (+) but the lines were VERY blue. I took two more test but were negative. Ive had preg symptoms such as Mood swings. Fatigue. Headaches. Going to RR frequently. Lowerbak aches. Sore boobs. Bloated. I have also been eating alot more than what i use to nd my bf has felt dizzyness at work nd also been eating alot! This last friday was exactly 2 months since my last period. Nd on saterday i began to get cramps then they got somewhat worse. Monday was the day i was suppose to get my other period which i thought i was going to miss. But at 3 am i got up nd i was bleeding alot. But before that, i didnt get any sign that i was getting my period nd i always do get a brown discharge a day before my period but not this time. Ive been bleeding alot with cramping. Also had big blood clots. Also i had spotting around when i missed my period Had brown then changed to pink then some little red spots. Then last week i got a white discharge Odorless! Had to use pantyliner.......Please Help!