I'm nervous and need advice

I'm 18. I'm a first time mom. I'm 34w 5d pregnant with my daughter. I've been having a lot of pelvic pressure and lower back pain. For the past 3 night's I've had intense, consistent cramping in my lower abdomen. And it's becoming harder to move around due to intense pain in my hips. Tmi, but I've also had diarreah for 2 days. I'm sure this is normal for late pregnancy as I'm aware of my muscles relaxing, trying to prepare for birth, but I just want to know if this could mean I'm getting close to labor. If I could get some answers or advice from people who have already had a child or children that would be greatly appreciated