I have a dumb question

[Bonita]

I believe Week 14 is considered the start to the 2nd Tri

[pirate]

I looked all over and couldn't find a satisfactory definitive answer. I was really disappointed to find out that the third trimester doesn't start until 28 weeks though, I thought it would be 26 or 27

[cactuscookie]

Jan 26, 2016 13:39:15 GMT -5 pirate said:

I looked all over and couldn't find a satisfactory definitive answer. I was really disappointed to find out that the third trimester doesn't start until 28 weeks though, I thought it would be 26 or 27

This whole thing drives me crazy, why does everyone define it differently?!

It seems to me that 40/3 = 13.3, so if you want to be conservative, second tri would start at 14 weeks (rounding up from 13.3) and third tri at 27 weeks (rounding up from 26.7). But I don't make the rules.

[Raggedeannie]

I don't know but I really started feeling better nausea-wise at 15 weeks. *shrug*

[Bernadine]

I saw the same 13/14 week confusion, so I just counted the 14th week.

[pinotgrig]

14 months is the general rule I've seen on 2nd tri.

Each month has an average of 4.33 weeks, so you can use that to determine how many months you are (how many weeks pg you are / 4.33).

Also, here's a chart showing how the trimesters, weeks, and months are laid out together.

www.babycenter.com/0_how-pregnant-am-i-pregnancy-by-weeks-months-and-trimesters_10326878.bc

[mrsp7309]

According to baby2see dot com, there are 3 different ways to calculate it. If you're going by development, it's 12 weeks, because that's when baby stops developing parts and just starts growing/maturing. By gestation, it's 13 weeks, 3 days, because 40/3. By conception, it's 14 weeks, because you're dividing the 38 weeks after conception by 3, then adding the first 2 weeks.

So... take your pick

[macmars45]

I went with week 13 for the start of 2nd tri and will go with week 28 for the start of 3rd tri. Two weeks till 3rd tri--eek!

[smock]

My OB uses 13 weeks for 2nd tri and 27w for 3rd.