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.
11 months give or take 2 weeks either way.
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.
The gestation period of the Springbok is 24 weeks.
no
Spiders have a gestation period of 9-27 days.