Do you carry the baby for 36 or 40 weeks?

Tonisha • FTM 01|15 💜
This is my first pregnancy and I have been confused as to when the baby comes. My OBGYN tells me that I have 8 more weeks to go , but that would be a total of 40 weeks pregnant...I have talked to other women who have conceived and they say that's too long. 😔 So my question is how long do you actually carry a baby????