Spotting

June 15th I had what I thought was the start to my period. I bled pretty heavy for one day and then stopped by 5pm. The 17th I found out I was pregnant. Our doctors appointment the 20th the doctor said I was 6 weeks pregnant. I havent stopped spotting since the 16th. It was bright pink until today when it turned brown but has gotten a tad bit heavier. This is not my first child but we have already had 2 spontaneous miscarriages one 2 years ago and one 1 year ago. Should I be worried? I cramp lightly and randomly. The doctor did say might be looking at miscarriages or eptopic but she said it was something she just had to cover if the bleeding got worse go to hospital. My appointment is July 1st for an ultrasound with a different doctor.