Could i still be prego?

Here lately i have been having pains in my head and back and they have gotten pretty painful...i started bleeding on sunday but it stopped and then started again monday morning and i was cramping really bad in my lower ab and back i was weak and i threw up and a lil diarrhea...my period wasnt at all normal...it's been really lite and it looks like its letting up and it only been 4 days and i go for 6-7 days...Whats wrong with me cld i be prego or something else thanks for you answers in advance.