Are these symptoms worrisome?

I have been feeling awful the last 24 hours. My stomach is in knots like my intestines are being twisted. It started off as period like cramps off and on. Then I think it was gas and constipation. I then felt better and my husband and I had sex. Then it came back about 10 minutes later and now it’s like a constant dull cramp that has stayed for hours. It hurts to walk around or move too much. I now also think i discovered some hemorrhoids so the bathroom is rough. I noticed when i saw some blood when I went to the restroom yesterday. I made sure it wasn’t the baby. Should I be worried? Should I call the doctor? I’m now 28 weeks.