Did my water break?

I'm a ftm and am due in 3 days with a baby boy. 

So earlier today I was lying in bed and my belly made a weird popping movement but I'm not sure if it was baby or not. Not long after I felt my panties were really wet so I went to the bathroom and noticed quite a bit of "wetness" that soaked my panties along with a lot of thick mucus (sorry tmi) and it was all over my thighs as well. Afterwards i started to feel more discharge just like when you have your period and started having some mild cramping an back ache. Am i in labour? Did my water break? Or does it sound like just regular pregnancy aches with discharge? I also put on a pad and have noticed more mucus. Thanks ladies!!