Ay, that sounds uncomfortable talaga, mama! At 33 weeks, constipation is super common kaya I'd really suggest checking with your OB about that abdominal at back pain, di rin kasi dapat ignored during pregnancy, better safe than sorry. In the meantime, try increasing your water intake at adding more fiber to your diet (fruits, vegetables, oats), and gentle movement like walking helps din sa amin dati when I was constipated.