I'm 38 weeks 1 cm dilated and I keep getting period like cramps in my stomach and lower back. And the pain shoots down my legs. They're 15-30 minutes apart and about 15 seconds long. They're stronger than the braxton hicks I've been having but from what I've heard not as strong as real contractions. Could it be contractions that'll soon be stronger? Or just really bad braxton hicks?