should i be concerned?

I am 29 years old and have a 3 and 1/2 year old child, but I have been ttc for 2 years now w/out success. I have been on clomid 50mg day 5-9 for 5 months now, I had an HSG during 4th month which cleared out my tubes, I have a 24 day cycle. My concern is that I have had brown bleeding on day 9 each month for the past few months. It always occurs on day 9 and sometimes has a small clot.