Need advice!

I was 8 weeks pregant and had a miscarraige on January 31st and had a d and c. Then February 20th had another d and c for tissue that was left.  I had my first period march 13th-16th and had unprotected sex the 17th, yesterday. I am 19, I worry I might have another miscarraige but I was told I am young and healthy and shouldn't happen again. Advice??