Braxton hicks or contractions?

Hi mummies! Im currently 31 weeks pregnant. Last night i experienced sharp pain n pressure around my uterus (lower abdomen) and lower back, walking/lifting my legs made it worst. It lasted about 20 mins, and i woke up with the bottom half of my body feeling sore and tired. Could it be braxton hicks or real contractions? Anyone experienced this before? I am really worried n i dont think real contraction at this week is ideal 😭