Light spotting at 7 weeks

Regina
Slight TMI alert - I've been constipated for the last day, finally was able to go this morning. Noticed some bleeding, much heavier from, er, my butt (sorry, guys) but I wiped in front separately. Noticed some very light pink bleeding that seemed to come from my vagina. (But maybe not??) Was gone after a few swipes.
I've had light cramping on and off for the 7 weeks of my pregnancy but nothing too painful. Haven't been to the doctor yet and can't go now as I'm away for the 4th. Does this sound normal?? Is it possible to be bleeding lightly because of uterus stretching/cervix sensitivity?