White flecks = miscarriage?

I'm 5wks pregnant. Have had a lot of cramping and I don't "feel" this pregnancy at all so I got a check up. Levels were good, only the sac was visible. I'm to check levels again on Friday.

I've just had a bit of discharge with white flecks and every page I've read says it's amniotic fluid.

Are there any other causes or am I having a miscarriage?