Stomach is solid and pressure feeling like I constantly need a number 2

Lisajane • Married to my absolute soul mate and best buddy we have a gorgeous little boy who is two in December ( it took us three years to conceive) and would love to be able to give him a little sibling
I'm currently 32 weeks and 4days and all day today my stomach has been really hard, and for the last couple of hours I feel the constant need to go to the toilet but without actually going if that makes sense. Anyone know what this could be, a bath did soothe it but as soon as I got out it started again. Any advice would be greatly appreciated x