can anybody tell me tht usually from which date we count the first week of pregnancy?? means we count  LMP date from the day when period comes or the last day(whether 5th or 6th day) cz periods stay atleast for a week...I m 36 weeks pregnant n my LMP is 2 dec 2016. but 2nd I had first dat of my periods n i actually don't remember when was the last day but for sure it was before 8....hope u understood my confusion...pl help. I have searched in google..it is said that pregnancy is about 40 weeks...or if my pregnancy is counting from 2 dec I m only 34 weeks pregnant n doctors after seeing no pain they choose Cesarean....may be I m wrong somewhere. pl guide