I am 31 yrs old. Have used BCP's, birth control patch, Depo Provera shots and finally a copper IUD in the past. I had the IUD removed in March of '06 and began charting using BBT and trying to conceive since this time. I have had brown or bloody spotting intermittently during luteal phase since I was around 19 years old. Some cycles it begins as early as 3-4 days post ovulation and sometimes it begins around 8-9 days post ovulation and continues intermmitently until menses. I am of healthy weight, do not smoke or take drugs. I do ovulate on my own according to OPK's and temp shifts on BBT chart. What causes this spotting and how can I stop it? Is it affecting my fertility? My menses are usually light to medium with little to no cramping and they only last about 3 days. The only major PMS symptoms I have are very sore breasts during luteal phase.