Trying again after loss...

Last week we found out we were having an early miscarriage at 7 weeks, emotionally hit a toll, we've tried to get pregnant for a year. Although the dr could not tell us when we actually lost the baby because during the ultrasound there was nothing in my uterus (I came bc I was lightly bleeding)... even though my body was producing hcg...at some point my baby didn't attach properly was my dr's assumption and miscarriage was inevitable. We are devastated, but coming to terms and getting through our grief day by day.

My Dr. Said to wait a cycle to try again, so basically 2-3 months bc this would count month 1, then period, then to try on the third. I have heard you are very fertile afterwards, just like after the dr tells you right after you've actually birthed. And to be careful, but why? Is it dangerous to get pregnant right after...does it double your odds of another miscarriage or birth defects? Can someone answer this?