Jessica Simpson
may look like she's going to give birth any minute -- but she insists she's still got some time left until she starts pushing out a baby!

"I have some weeks. I really do," she told Ellen DeGeneres on her talk show today. "It’s not like tomorrow!"

Simpson, who confirmed on Leno that she IS NOT having twins, also told Ellen she's started going through Braxton Hicks contractions.

"It’s like these contractions that pregnant woman have towards the end," she says. "It prepares your body for delivery. I’m prepared.  It’s scary. It’s like oh god, this can happen right now."

Of giving birth, Jessica adds, "It will hurt very badly."

Check out the video above to see Simspon talk baby names -- plus see the hilarious gift Ellen got Jessica for the day she gives birth!

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