Ay, 35 weeks na! At this point, normal lang talaga ang lower back pain at cramping, ang uterus mo is getting ready na, kaya maraming Braxton Hicks at pressure down there. A few of my mum friends said parang ganyan sila rin around this time, especially pag nag-walk or nag-sit ng matagal. But just to be safe, mas maganda kung i-check mo with your OB, let them know kung gaano ka-intense yung cramps at if may discharge or other changes, para makita nila if everything's on track. Rest when you can, try warm compress sa back, at don't hesitate to call your doctor kung nag-worry ka talaga!