what part of the body does the turtle carry her eggs? i can't tell the sex,they are in fish tank.?

Turtles are like every other vertebrate. Reproductive products are carried in the lower abdomen until ready to be introduced to the outside world. In the case of a turtle, this will be in the form of soft-shelled eggs about the size of the turtle's head that are supposed to be laid in a nest on land. Eggs don't normally take up enough volume to make a visible difference in the bulge of the shell. If the turtle lays an egg in the water the egg dies within hours - you need to take it out and make a nest for it.

Google "turtle eggs"

Look up your specific species of turtle. Some species of turtle/tortoise have differences in the plastron (bottom shell).