I NEED HELP!!! PLEASE!

So on July 13th (Friday the 13th) I found out I was pregnant! Me and my boyfriend were so excited! Well 2pm the 14th I was bleeding really bad. After testing I had lost my baby and my levels were high enough for the doctor to tell me I was 4-6 weeks pregnant. Well I was supposed start August 13th-17th and on the 18th I started bleeding but it was heavier than before and then it stoped the 20th. I woke up that morning and it was gone. Is it possible I could be pregnant again? Or is this normal with a miscarriage? (Btw I lost our first baby).