Calcite with Palygorskite from Metaline District, Pend Oreille County, Washington. Calcite with Palygorskite from Pend Oreille Mine, Metalline Falls, Pend Oreille County, Washington. Cerussite on Galena from Gladstone Mine, Leadpoint, Stevens County, Washington. Cervantite from Wells Fargo Mine, Deer Trail, Stevens County, Washington. Coprolite (fossilized feces) from Washington.
Of course being born 12 wks early was tough but I had an incompetent cervix thus the early delivery and 7 weeks of hospital bedrest were critical. Most triplets are born on average at 33 weeks but doctors will schedule c-section for 36 weeks. I have friend who made it to 36 wks but this is very unusual. Most women go into labor at about 34 weeks and then the babies will spend between 1-2 mos in the NICU.
The 280 days is full term plus 2 weeks prior to ovulation--when you weren't even pregnant. If you go by the 40 weeks (280 days) the prior poster is right. The math would be 13.3 weeks and you would be in your third about 27 weeks. If you go by 266 days, you would be starting your third trimester in the 25th week. So, docs go between 25-28 weeks for that reason. Why any doc would ever say that the third trimester starts in the 30th week is beyond me.