The National Zoo in Washington won't know for sure until this summer, but officials say their giant panda might be pregnant.
Mei Xiang (may SHAWNG'), who was artificially inseminated in March, is said to have rising hormones -- a possible sign the panda is expecting a baby.
However, she could also be experiencing a "pseudo pregnancy" -- ovulating, but not conceiving. The zoo says that is common in giant pandas, including Mei Xiang.
The pregnancy question won't be answered for another 40 to 50 days. That's when the zoo expects the panda to either give birth to a cub, or the symptoms will stop.
Officials say ultrasound testing has not detected a fetus.