Aiyah, at 35 weeks this is actually pretty normal lah, those are Braxton Hicks contractions, your uterus practice tightening before the real labour comes! But that sensation of something wanting to come out, especially when you need the loo, is worth mentioning to your doctor next checkup just to be safe and put your mind at ease, ya. A few of us mums had the same thing and doc said it's just the baby's position pressing down, but better you get it checked since you're already worried about it.