Miscarriage - help?

I was 6 weeks, but went to the ER last night and was told I most likely had a miscarriage. They couldnt locate the baby by ultrasound and my HCG levels only went up 300 in 9 days. This was my first pregnancy. I am still in shock. How did you cope? Any advice? How lomg before you can try again? Thanks for any advice or love!!