38 weeks and 2 days Braxton Hicks or contractions?

I’m pregnant with my first baby. I’m 38 weeks and 2 days. I’m not sure if I’m having Braxton Hicks or contractions. My stomach tightens up and the pain does take my breath away. I’ve been timing them for 2 hours. They are on average 6 mins and 15 seconds apart lasting an average of 50 seconds. Any advice?