33 weeks pregnant and have brown discharge

Is this something to be concerned about? I had wiped to make sure it came from the vagina and it was brown as well. It’s not caused by sex or a pelvic exam or anything like that

. I’m also on contraction medication to help with painful contractions. I tried to call Obgyn, but they don’t have any after hour numbers and recommend calling the labor and delivery department of a hospital nearby, and the labor and delivery department says they won’t tell me whether to come in or not so I’m just confused. The baby is showing that he is ahead of his growing group by 2 weeks but they aren’t going to change my due date so is this possibly a sign of labor? I’ve never had a baby before.