I had horrible back pain and felt like I needed to shit myself the day before I went into labour… maybe time contractions and see if there’s a pattern? If the cramps are manageable then it’s not full blown labour yet
It sounds like early labour if its come on suddenly... If you've had the pelvis pain for a few days it's spd/pelvic girdle pain which I had the last week/two of pregnancy... The pressure is the baby getting in a good position and feels like you need a number 2 it's horrible... The pressure and pain together sound very promising sounds like you'll go into labour any day now I was like this and felt so tired from 40+6 days to 41+1 day slept all night plus naps then went to bed and got up twice for the loo and then the final time getting up my waters broke... I was booked for my induction on the Wednesday and really didn't want one either...I ended up having her 2 and half hours after my waters broke so I was 41+2 days. I think you'll have the baby very soon - all the best!
You can get a belt for this for your belly sounds like psp I had it for weeks ended up bed ridden with mine