An alpaca's gestation (pregnancy) typically last from 335 days to over 400 plus ~ yes it can last over a year! Based on typical birthing on our farm, we set their due date at day 350, but realize that cria could come before or after.
Today our own Tehya is on day 350 gestation:
To me, her face is saying "not today".
Ok, actually it's that her tail is down and she has been acting completely normal all day. (The signs we look for: milk bagging up, loosening on their back end, and as labor starts multiple trips to the poop pile. Then there are the clear signs like bag of waters erupting and cria coming out. Tehya has been pretty loose and bagged for for a couple weeks now, which can happen that early, she's close but not actually in labor yet.)
While her belly looks big:
I admit, I've seen bigger more uncomfortable pregnant bellies. This is only her second cria; in 2011 she gave birth to OHVNA Cheyenne (links to that birth story and pictures of Cheyenne). It seems it's often the older dams who look the most worst for wear by day 350. Tehya's last cria was born on day 356, so it I'm guessing this week is a likely birth day for this one.