ladies need help...

So I haven't had my period since Aug. 13 and i should of had my period already but I have taking test after test and all neg. besides 1 pop positive and after it did Sep. 11 I ended up going to the e.r bc I was bleeding and it wasnt normal bleeding doctor said it was implantation bleeding which is a sign of being pregnant..... lately I have been cramping bad but no period my breast hurt so bad im peaing a lot and throwing up all the time so I took a few more test and they all say neg. I'm a little worried and scared bc I have had miscarriage after miscarriage please help....and My question is can I be pregnant and still get neg. after neg.??? and please no bashing.