Constipation. Please help me. I’m miserable.

Hey ladies I’m almost 21 weeks pregnant. I have severe constipation and I’m at a lost on what to try next to help. I talk to my OB and she said do miralax and colace. I tried that and did not help. I drink tons of water, I stay active and I have been eating oatmeal and Raisin Bran to try to help. I have no clue what to do. TMI I have not went in almost 2 weeks. I am miserable. Any advice on what helps you go? Thank you so much ladies in advance