The only way to know for definite is to have the hospital check, they get women mistaking waters for urine all the time so don't feel bad if you do decided to go in. It's a very common misconception because we have such little control over our bladders in late pregnancy. Try walking around with nothing on for 30 mins or so and if your feeling water trickle down your legs then it's very possible it's your waters. If you can't walk round with nothing on put on a pad, do the same thing and check if it's wet. Even if it's a small leak if it's your waters it would be a continuous leak of water however small.
It could get uncomfortable sometimes, thats how i felt all day yesterday but wore panty liners and noticed a brown/redish discharge wich means my cervix is opening and getting ready for labor. You should try it and if u see more uncontrollable fluid, its safer if you go and see if its time, women do it all the time. Better safe than sorried. Good luck you're so close to meet your bundle of joy!