When to call the doctor?

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So I’ve been having real contractions since Thursday afternoon. They started about 15-20 min apart then got to 3-5 and back to 15-20 sometimes 30 minutes apart. Last night/this morning I have been losing my mucus plug and having bloody show. Currently my contractions are about 8-10 minutes apart (and have been for almost two hours) but are getting much stronger. Should I call my doctor? What should I do?

Oh also, I’m 40+1