well, late pregnancy u/s can vary + or - 2 weeks. you could have ovulated earlier or later in your cycle.
If you were 13 weeks on 18 December you conceived on or around October 2nd.
No. Your due date is calculated from two weeks before actual conception. You are actually pregnant for 38 weeks. You conceived 18 weeks ago.
I just had a child and I had no idea when my last MP was or when around he was conceived, but if you know already how old around the fetus is, then you can get somewhat of an idea, but it won't be exact. Yes. If you count back two weeks less than the length of your pregnancy, that is approximately when you conceived. For example if your dating scan says you are 10 weeks pregnant, counting back 8 weeks will give you your approximate date of conception.
Yes, that is possible. You can still have a period while pregnant, thought it usually looks like spotting or gets lighter. You could have also conceived while on your period. I hope I helped!
At this stage there is so much variation in babies sizes that 10 days difference is not important. EDC is based on LMP by the way, it may be adjusted at an early (before 12 weeks) scan, but not at 26 weeks.
What are the possible consequences of weaning before 17 weeks?
You conceived approximately 3 weeks before you realized your period was late.
You conceived 4 and 1/2 weeks before you wrote this question. Check your calendar to see the exact date.
No. The conception date is about 9 months or 40 weeks before the date of birth.
When you have a dating ultrasound you are given an EDD (estimated date of delivery) If you count back 40 weeks from this date it should be about when your last period was. If you do not have a regular cycle they may not correlate exactly. 38weeks back from your EDD is approximately when you conceived.
According to dating calendars, pregnancy officially lasts 40 weeks, beginning with the first day of the last menstrual period. We know that most women ovulate around day 14 of her menstrual cycle, which means the baby wasn't really conceived until at least week 2. Thus, if the doctor says you're 25 weeks pregnant, the baby was probably conceived about 23 weeks ago. There's sort of a disconnect between medical dating (40 weeks) and layman's dating (9 months). If you're 25 weeks pregnant, though, you have 15 weeks left to go, which puts you about 5 1/2 months pregnant.
After the implantation of embryo on the wall of the uterus has taken place, it takes 40 weeks for the foetus to fully develop. In most cases, the time period before the baby is born is around 40 weeks.