Spotting 7 weeks 4 days

I have had on & off spotting for 2 weeks or so. Pink and brown. I went today and got an ultrasound baby looks good strong heart beat. Doctor said just to monitor the spotting that it looks like there isn’t a reason it is happening. Just curious if anyone went through this with no reason for the spotting and how everything turned out for you? I didn’t spot when I was pregnant with my son but when I had 2 previous miscarriages I did spot with those.