oh god, meandmyboy
yes, I had this, twice in early pregnancy and ended up being catheterised
I know it sounds odd, but try drinking a lot - are you constipated? The problem with me was that I was and the bowels were pressing on the tube that led from the bladder (can't remember what it was called)
This meant that the muscle couldn't contract so I could wee
I was like you to start with but then it got really really bad hence the catheterisation.
So, drink lots to get your bowels moving, sunflower seeds are good too apparently and of course, fresh orange juice./ Cranberry juice is good for helping your kidneys out
Another thing that might help - detail here, so brace yourself. Sit right far back on the loo and open your legs quite wide. Then lean forwards and see if you can wee then. If not, try holding a wedge of toilet paper against you and try again - so you end up weeing through the paper and your fingers
And tell your midwife / gp. they can prescribe lactulose, which makes your poo softer so you go a bit more!
sorry for the detail, but believe me, you don't want to get to the point where they have to empty your bladder for you