Hi,I'm 17 ...me and my boyfriend had unprotected sex on july 14th...i got my period on july 26th but it was light red and only lasted two days instead of four and exactly a week after I had sex i threw up.... every since after my period I been cramping my back has been hurting.. frequently urinating with slight pain after and I feel tired and drained all the time...my breast aches on and off...I have been eating alot but nothing out of the ordinary... I been getting frustrated when ppl try to talk to me and sometimes I get shortness of breath... my stomach has been cramping and back has been hurting for almost a month and breast been aching for almost two weeks ... could I be pregnant?