N.,
I didn't spot at all with my first pregnancy but did spot (pink actually, not brown and even further along - 11 weeks?)with my second. She came out healthy and strong!
I was worried too but called my midwife who said that it's very normal to spot in pregnancy sometimes. She's even had women who bled as much as several ounces and delivered healthy, full term babies.
Try to eat regularly, hug your little girl as much as possible, get some rest (you'll feel a lot more calm if you do!) and do something you enjoy.
Every time you worry, take a deep breath and imagine a white light around your baby, protecting her (or him), nurturing and helping her grow safely inside you.
I'll be praying for you!!
M.