Brownish clot like discharge for several weeks

Hi,

I am 23 years old. At the end of March I noticed slight brownish-pinkish discharge after using the washroom. It was quite noticable during intercourse and for about a week afterward was noticable enough to wear a linerduring the day, but is not a suspected period. It got really light thereafter and turned to a brownish clot-like discharge and only was seen when using the restroom and a little in my panties. Still continuing today a month later. Not quite sure what is going on, there is no itching, burning, or foul smells, no cramping or nausea. Feeling fine otherwise. I have been with the same sexual partner for 8 years and I have two children. I am not on any sort of birth control. I had my last child 10 months ago, and have had normal periods up until this past month. I have heard of spotting during pregnancy but I thought it only lasted a few days, this has been going on almost everyday now for a month. I really don't think it is pregnancy, since it's not really light and an on-going problem for several weeks. Could it still be pregnancy? Any suggestions or advice would be appreciated
Thanks

Melissa