So confused! FTM. Please help! 😭

39 weeks 5 days... Since last night I’ve had pretty dull back pain and period like cramping that is constant. I woke up around 3 AM because the pain got worse! I’ve been awake since with the pain continuously getting worse and staying constant. I’ll occasionally have tightening in my entire uterus. But when that happens I have no pain. I called labor and delivery and they pretty much just said it could be something or nothing. 🙄 has anyone else experienced something similar??