Miscarriage

Emilie
I had a miscarriage on Memorial Day, I was 6 weeks pregnant with twins. I have still not gotten my period and I'm still having symptoms like I am still pregnant (morning sickness, hungry all the time, cravings and always tired) I had called my doctor and they didn't seem concerned. I also took a pregnancy test and it was negative. Anyone know if it's normal or experienced this as well?