I had bleeding and cramping early on for several weeks while pregnant with my twins but they are perfectly healthy toddlers now. When my bleeding started it was heavy, sudden, and through my clothes. (TMI?) We already knew we were having twins (fertility help so had a u/s at 5 weeks) and thought for sure I had miscarried but all was fine. I also had lighter spotting throughout with my singleton pregnancy and she was as healthy as can be. Doc wasn't concerned since bloodwork was always fine. Easier said than done, but try not to stress yourself, relax when you can and drink lots of water. Congratulations to you!
Congrats on your pregnancy!!! You really won't know anything until your u/s, but I wanted to let you know I bled red/brown from about week 6 to week 16 of my pregnancy. Pretty much everyday. Drink lots and lots and lots of water to keep your uterus hydrated, and keep your feet up as much as possible