Its not like they just add 2 weeks, they measure from your last period and its 40 weeks from that. Most women have a 28 day (4 week) cycle and since you usually ovulate around the middle of your cycle and that's usually about the time you conceive, its like the basically add 2 weeks from when you probably conceived. So for purposes of counting, its sort of like your 2 weeeks pregnant when you conceive. seems crazy but that's how they do it.
2 weeks
yes it takes about 2 weeks
Weeks gestation
From TheBigZoo: "After a gestation period of about 11 weeks, Meerkats give birth to a litter of 2-4 cubs."
2 months All dogs gestation periods last for around 9 weeks.
45 The average gestation for a mare can range between 320-370, or about 46 weeks to about 53 weeks.
44.3 to 53 weeks with an average of 48.6 weeks.
gestation is the amount of time someone has been pregnant. Usually described in weeks. So at 6/40 gestation you have been pregnant for 6 weeks.
11 months give or take 2 weeks either way.
The gestation period of the Springbok is 24 weeks.
no
Spiders have a gestation period of 9-27 days.