bleeding and cramping at six -seven weeks pregnant?

i found out last week that im about six and half weeks pregnant, since then ive had severe cramping worse than when i get my period with some bleeding which seems to be getting heavier. i havent really passed any tissue like most women do during a miscarriage but i need to know has this happened to anyone else before and did it turn out that you were having a miscarrige.i went to the emergency and they were pretty much useless so i decided to turn here because my questions always get great answers. thanks for reading and for any advice i highly appreciate it.