TTC after mc :(

I found out I was pregnant Jan 13th and had my first app. Feb. 4th. Around jan 30-31st i had some bleeding and went to the walk-in. They didnt tell me much info.. but said i would find out more at my appointment feb 4th.. They did tell me my levels were rising from when i was bleeding but there was no baby in the sac and that it had probably died at 5weeks 5days.. I still have bleeding but no severe cramping. I go in tomorrow for more blood work and another US. Any suggestions on what to expect or do? I havent passed the baby and they might suggest a D&C. I've been trying since June 2014 for a baby.. and don't know when I should start trying again.. Or what i should do next time to prevent MC. Any advice?? :(