Preterm labor and procardia

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Has anyone gone into labor while taking procardia 2+ times a day? If so, how did you know you were in active labor? The medication has never fully stopped my contractions (been taking it for 9 days) but the last couple of days they’ve felt a lot lower and I feel tightening in my lower back. With my first daughter I knew when I was in labor because the contractions were very painful but this time I’m on procardia so idk if that changes anything.