Hi!
If you were my patient, I would advise you that your dates are way too close for guessing. If the LMP date you give is the first day of you period, that would put ovulation at about the 23rd, so the 18th sounds a bit early, although sperm can survive for up to 5 days in a woman's reproductive tract.
If there are any paternity questions, a DNA test is the best bet.
Good luck!
Dr B
Too many numbers to figure out sorry im just confused x, but i also have 32 day cycles and so my due date is a week later then it woulda bin if i just went by lmp, the ultrasound dated it that way and ive had 4 n date hasnt changed , ultrasounds ho by messirment and are very accurate in very early pregnancy , so go by ultrasoubd cuz i ovulate a week later about you most likely do also give or take few days, i doubt i answered u but novody else has so hope i gave ya sOmething
I put your due date on my app and it says Dec7th