FTM 35 weeks pregnant only 18 years old

So I’m a FTM and I wanna know what going into labor feelings like? Or signs besides your water breaking or loosing your mucus plug?

Lately I’ve been having a lot of gas and needing to use the restroom a lot.. is that a sign of labor coming soon?? Also when do the doctors start checking to see if you started to dialate?? As also my thighs and down there have been feeling a lot of pressure & sore.