Post # 1
So this is a dumb question. I have my first doctor appointment in the beginning of July but I saw a regular doctor just to confirm I was pregnant. He said based on my last period, my due date would be Feb. 12, 2015. My last period started on May 5. I thought that would mean I was about 5 1/2 weeks. But all the apps I have say I’m just before 5 weeks. Anyone know how many weeks I would be? Thanks and sorry for such a silly question!
Post # 2
RoseyBee: According to the date of your LMP you are 5w2d. Everyone doesn’t ovulate on exactly CD14 so date of conception/due date could vary by a few days. You’ll have a better idea at your first ultrasound where they’ll measure the baby.
ETA: Congrats !!!
Post # 3
xdaydreams05x: Ditto this. If you know when you ovulate, and how long your cycles are, it gives a much more accurate dating measurement than going by LMP alone.
Post # 4
- Wedding: April 2013 - Rhode Island
Yeah, my LMP is completely inaccurate because I have 19 day cycles and ovulated on CD8. This whole pregnancy dating is a confusing mess IMO. By the time the baby implants, which is usually 6-8 days past ovulation, they consider you 3-4 weeks pregnant. Something about including the day you ovulate as part of the pregnancy…I don’t know. I’ve been confused this whole time. LOL!
Post # 5
Christy42213: It is very confusing! They have a bunch of different terms for what they are calculating. Basically what everyone knows is that you are pregnant for 40 weeks, well that isn’t really the case – it is just easier and a standard for OBs to estimate your due date by counting 40 weeks from LMP. You are clearly not pregnant for the first few weeks in that method. That is standard across the board, so like you said by the time you ovulate you are two weeks, and by the time of implantation you are three-ish. I had an early ultrasound done at 8 weeks to determine how far along I was because I have very irregular cycles (70+ days) so they wanted to confirm. However, that isn’t always the case and they might just take your word for when you ovulate or go based on LMP even though it could be off a week.
Post # 6
RoseyBee: My last LMP was 7 May and I’m due on 11 Feb – we are almost due date twins, however if i use a dd calculator that asks the length of my cycle, it says baby is due on 8 Feb and I am 5 weeks 4 days. It’s a bit confusing
Post # 7
Yeah they use LMP probably because most people know the date of their last period but most don’t know when exactly they ovulated. So it’s just easier for them. This assumes a standard cycle though…so when you ovulate, you are already two weeks pregnant. It’s going by the age of the egg, not from the date of fertilization/ovulation. Of course, if your cycles are far off from the norm, your due date would be off.
If you get an early ultrasound they can give you a more accurate due date and estimate how many weeks you are. EDD is just an estimate anyway, a few days difference is really not a big deal in the end.