Is it possible I'm having signs of actual labor?

Nikki • Due 6/20/16
I'm 24 weeks pregnant today and got in a huge fight with my fiance last night which brought on Braxton Hicks contractions and I was so stressed and upset I threw up a few times. I've been having lower back pain and braxton hicks since last night..its been pver 12 hours and it feels like its slowly getting worse. TMI I also keep getting what looks like parts of the mucus plug on my underwear and everytime I wipe after using the bathroom. I can still feel my daughter kicking though but I can't tell if some of the pain is from her kicking since it hurts a lot and she usually doesn't kick me hard enough to cause this much pain. I've also been nauseous all day long and tired so I've just been in bed. I know my doctor said she would most likely come early and that stress can cause early labor but I don't know what to think right now. All I know is I'm scared and in pain.