Let start by saying I have a son now. I bleed this way for the first 6 months. I have altrusound after altrusound. It came every 3 weeks just before I would get my period on a normal cycle. So it was like I was getting my period on time every month this happen to my 6th month. They said the pain was from the baby growing and streching. Mine you this was my second child and I was going through this. All I can say is try and relax, what will be will be. I have a twin sister she said she had this for her entire prenancy. Its normal.