Unportected sex, posibly pregnant, but bleeding!?

I had unprotected sex about 2 weeks ago while i was fertile ( which was very dumb of me) and have been very tired, was urinating like crazy for the first week but i do not go as often now, but still more frequently than normal on some days,i have had mild nausea and a constant mild ache in my lower abdomen and some sharp pains every so often, mainly around the 7th & 8th.. im only 17 and have had to quit my job because i was giving people the wrong information because my mind was going completely blank and had turned to mush, not to mention i sometimes had to struggle to not fall asleep while standing there!! also over the past 4 days my breasts ave been getting tender and if i hit them accidentally they can feel like they are aching and burning for up to one minute later.. i am meant to be testing to see whether i am pregnant or not in the next 2 days, but just today i woke up feeling unwell and have had cramps for a while, i also have started bleeding, could this be implantation bleeding and cramps or just my period even though my period isnt due for another 2-3 days.. i am very confused and sick of waiting!!! if anyone has ne info to give me it would be much appreciated!