Good evening! Girls, could you please tell me I'm in my 38th week and …

Good evening! Girls, could you please tell me I'm in my 38th week and pains started! Sometimes it hurts, sometimes it lets go of the lower abdomen, there's a feeling like colic or something is pulling down from below and shoots pain! What does this mean?! Training contractions?! I had a check-up with a doctor, everything's fine, the belly dropped ?