Dull aching pain in rectum at 29 weeks

Sorry this is TMI, but I am 29 weeks pregnant and have been getting this dull aching pain in my rectum on the left side. I have been constipated lately: I don’t have any visible hemorrhoids but have has flatter stools and some blood after having a bowel movement. The dull ache happens throughout the day and my doctor said possibly internal hemorrhoids and/or the pressure of the uterus pushing on the rectal muscles. She said if it continues to get worse we will look further into it. Just wondering if anyone else has experienced this before? I never had this with my last pregnancy and it is so uncomfortable! My doctor prescribed a suppository to treat possible hemorrhoids but it has not been helping. Windering if anyone has any tips for relief?