In labour day before his arrival

Courtnie • I am 22 and I'm a Mother of a healthy happy lovable 2yr old son . && I'm expecting my second prince 7.14.16 💝
Have been having severe pelvic pressure alone with rectum hurting at the same time for 2-3 days now plus lower back pain and contractions every 5 minutes!(just started tonight) as well as I took a warm bath and still didn't do justice. This pelvic pain had woken me up out my sleep alone with the contractions. What is going on?? I have a scheduled csection Thursday morning but I'm not even sure if I can hang in there. Haven't noticed a list of mucus plug nor water hasn't broken so I'm at shocked that I even have all this going! On top of it all I don't even have my son things packed nor the rest of mine so I'm really hoping it wears off at least to give me time to finish packing.. Can someone relate and tell me something is this even normal even tho this will be my second csection didn't have this with my first???