I never asked my doctor about this. I always assumed it wasn't a big deal. However, the calculation isn't adding up.
If I were due May 19, then the first day of my last period would have roughly been August 12. Now that would be impossible since I ended my last period on July 22/23. There is no way I would have ended my period on the 22 then started again on the 12.
I had surgery on July 22 to check for cervical cancer. I had abnormal cells growing on my cervix. The doctor clipped a chunk of my cervix off then flushed my uterus with vinegar. I never had a period after that and I was on birth control. I believe the surgery helped me conceive. However, that would make calculating this tricky.