Should I go to the emergency room? I am 6 weeks pregnant and have been spotting on and off since yesterday, while I know that is common in the first 20 weeks, I had PID about three years ago and read that 50% of women who have had PID end up having ectopi

Yes. Bleeding or spotting early in pregnancy is never normal although bleeding doesn't always mean an abnormal pregnancy. You should be seen by your doctor soon to assess the location and status of your pregnancy. Miscarriages, infections, and ectopic pregnancies need to be ruled out.
Yes, . Yes, you should be seen as an emergency. Past infections can cause a pregnancy in the fallopian tubes which is very important to diagnose right away. Please be seen immediately.