It is better safe than sorry! I went to the dr the other day and mentioned cramps in my sides and she made sure I wasn't feeling anything by my ribs. Hope you feel better
Most certainly doesn't sound like poop cramps I've heard contractions described as pain in the back sometimes. Absolutely worth at least calling your doctor I'm almost 18 weeks and never experienced pains like that before. Idk what Braxton hicks contractions are like perhaps its those but I wouldn't risk not talking to a doc personally
No you should definitely go as soon as you can.
Every pain at every place you described is normal especially during your first trimester, my concern for you is when you said it has been over 3 hours and it seems to be getting worse, that is not normal. Please go see a professional. Best wishes!