Mama, please see your OB or go to the emergency room if the pain is severe or you're worried, better safe, lalo na at 34+ weeks ka na! Back pain is pretty common sa pregnancy, pero since you're far along and the pain's persistent kahit nakahiga ka, kailangan talaga i-check ng doctor para masiguro lahat okay lang sa baby at sa'yo. A few of us mums had similar concerns, at ang doctors namin nabigyan kami ng proper guidance, some needed support, iba naman posture adjustments lang. Don't worry too much, but do get it checked out soon, okay? Thinking of you!