Pregnancy with tubal???

I had a tubal ligation almost 9 years ago after my 3rd child. I was 24 and it was done during my c-section. I am 3 weeks late on a usually regular 38 day cycle (I've never passed 40 days). I am emotional, slight cramps (my boobs only get sore before my period, never during pregnancy and they are not sore) and I feel that odd knot in my abdomen when I lay on my stomach. All tests are negative.

I'm wondering if anyone has, or know someone who has gotten pregnant with their tubes cut, tied and burned. Is it actually possible?

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