Could be anything from hemorrhoids to cancer. You need to see your doctor for a diagnosis.
I had the same thing - excessive bleeding from behind. I am used to having loose stools - and with the prenatals that I have been taking my doc told me that it will firm up the stools which can cause rectal bleeding. Also hemmeroids are common in pregnancy. Some apparantly can be seen/felt from the outside and some from the inside. I have heard this too can cause bleeding...not sure if it will cause excessive bleeding or not but it could be a possibility. My doc told me to take Metamicil with OJ and this should help me...so far so good. I would def. bring it up with a doc as it could be an indicator of something more serious, but if you are preg - I would think its just one of those common enough things that ppl just dont openly speak about. Good luck.
I developed a hemmeroid after I had my daughter.
Sometimes it bleeds on me.
It could be something more serious and should be brough up immediately with your doctor.