With my first child I would bleed monthly. Almost like my monthly period. Every month I would get worried and yet everything was ok. The explanation I got was this can happen to some women.
I'm currently 21 weeks along with my second and I've had one episode of bleeding and that was because the placenta grew into a blood vessel.
I bled from week 6 to 16 of my pregnancy. Red, brown, heavy, light. Just about every day. My twins are now 27 months old.
So, it does not have to mean the end.
You need to drink lots and lots of water. Then drink more. 80oz or more a day!! It keeps your uterus hydrated. Keep your feet up as much as possible.