Any advice

Hey ladies, so for the past 2 to 3 hours ive been having the WORST lower back pain along with tightness in my stomach. it feels NOTHING like a period cramp but instead feels like theres so much weigh in my stomach and its almost like weighing me down. its a cramp but nothing like a menstrual one. someone even commented on how my stomach like more firm today because of how tight its been. i was thinking maybe contractions but i couldnt time anything. its all so random, im 34 weeks. thanks!