I too spotted during my first two pregnancies. With my oldest, I spotted for all of my first trimester and most of my third trimester (including one time with a lot of really red blood around 6-7 weeks). With my second, I spotted for my first trimester. They never really found a reason for it, but the doctor said that this can happen with the growth of the placenta, which ends around 13 weeks. Now I have 2 very healthy beautiful girls.
The important thing to remember is that there is nothing you can do or could have done about it, except for continuing to act healthy yourself. God, your body, and your baby are in control of the outcome. Bedrest, etc. won't do anything at this point.
Good luck and I hope for a wonderful outcome for you!