Spotting entire pregnancy

Cher
I am 16 weeks pregnant and have had on and off brownish/red spotting since week 12 when a cervical polyp was taken off. After 2 weeks of bleeding I went in for a full ultrasound and vaginal ultrasound to look at baby and cervix. Everything looked great! I thought I was done with the bleeding until today (after 2 weeks of nothing) I go to the bathroom and there it is again. Anyone experienced this their entire pregnancy?