Freaking out!!! Losing mucus plug at 30 weeks, should I be worried?

Mercedes

I just got released from the hospital this morning after being on the monitors all night with contractions. Also they did a fetal fribronecton test that came back positive. Contractions have slowed and become less painful since last night. But lost what I'm pretty sure is my mucus plug about an hour ago along with a significant amount of clear fluid, enough to soak through & leave a big spot on my jeans. (I know it wasn't urine).

Ps. This is my 2nd pregnancy, first pregnancy was full term.

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