So what do labor contractions feel like?

I'm 40 weeks and 1 day FTM and at this point I don't even know what I'm supposed to feel in terms of contractions. 
I feel fine with a few period like cramps here and there but nothing unbearable. I think those are my contractions but Everytime I go to doctor, they say I'm not contracting, not dilated, cervix is shut, etc... No signs of labor ever... I don't even know what Braxton hicks feel like at this point...
I just don't know what I'm supposed to be feeling or looking for? What do real contractions feel like? Please describe 

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