Am I in early stages of labour?

Lost lots of clear mucus plug this morning at 10:30 & some more tonight. I have been having period like cramping on & off all day down in my lower abdomen/groin since 11:30AM this morning. The pains have got a bit stronger but are still bareable at the moment. Have also had a bit of diarrhea today! I am 41 Weeks + 3 days. Could I be at the start of labour?

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