Contractions at 35 weeks

Alisia
Hi Ladies,
35 weeks yesterday and I've started having much more frequent contractions that are stronger than before (about 4-5/hr). Baby is more active, and I've started losing bits of my mucus plug. I'm not allowed to labor and am scheduled for a cesarean in 3.5 weeks. Anyone experienced mamas wanna take a guess at how long before I have to hit L&D? Also, is it normal to have a contraction after each time that I pee?