contractions or Braxton hicks

Varie • Mother of two , I have my prince 👑 & waiting for my princess 👸 to make her grand entrance 😍😘❤️💕🎀
Hello ladies , I'm 34 weeks & I just had my growth scan they told me that baby is very low! I have not been feeling good , late night been throwing up for two days str8. So today I'm not sure if I'm having Braxton hicks or contractions. My lower back hurts on both sides, and my pelvic area hurts when I'm sitting up and walking.. I have to lay down and even then it still hurts . This is my second pregnancy but with my first I didn't feel any contractions . My stomach isn't tight or anything . Can someone help me