Sooooo worried

Tegan
Hey guys i just got a blood test today which confirmed I was pregnant, it's been 6 years since I've had a baby so i sort of forget alot about what to except in pregnancy but I need some advice to calm my nerves. Well where do i begin. 6 years ago I had twins boys which came at 33 weeks but water broke at 32 and when they were born my placenta was pure black and the doctor doesn't know. I've been reading up women who have premmie babies can have another premmie baby. What are the chances of me having a premmie baby again? My first pregnancy was full term then the twins came at 33 weeks and now im pregnant 6 years later and im worried ill have another premmie. Has anyone women also had BV DURING there pregnancy and had a healthy baby? I get this crap once a month every single month no joke and im worried about that to. Im so stressed im gonna lose the baby I'm so attached already.