34 weeks and 4 days

Yesterday I woke up in pain cramps and back ache the only thing to stop it was to get out if bed I was literally gripping the bed sheets. Today I kept tossing and turning for an hour- hour an a half with period like cramps and horrible lower back pain it's been almost 2 hours and just won't go away just took tylenol and a bunch of water... hope it's only dehydration or braxton hicks..? Anyone else experiencing this? Or have experienced this?