Brown discharge after bowel movement

Lindsay
I'm 5 weeks and 3 days pregnant with our first, after trying for a year. I had very light pink spotting last Thursday after a bowel movement and then it immediately went away. But I rushed to the doctor anyway and he said he thought it might just be implantation bleeding. Then this morning I had very light brown discharge and figured "ok deep breaths it's probably just old blood from the IB"... But then just now after a bowel movement I had a decent amount of brown discharge and one very small super dark clump of blood. But I haven't had any cramping that was beyond a small couple of twinges last week.
Do you think it could be from forcing a BM? Someone please tell me they've experienced this and then went on to have a healthy pregnancy. I want this so badly and am driving myself crazy.