Of course, you’ll need to create a nesting site. However, you also need to check other things in the enclosure. The behavior change may be due to other reasons apart from gravidity. If the turtle shows the signs described above first check the conditions within the enclosure. Conditions such as bad lighting, inappropriate temperatures, and poor water quality can cause the turtle to start behaving differently. Correct issues with the enclosure. While you can palpate the turtle and tell if she’s carrying eggs or not, I recommend that you leave this inspection to an experienced turtle breeder or a veterinarian. Rough inspection can lead to egg breakage, which can lead to yolk peritonitis which is a serious condition. Palpation is done by inspecting the areas around the hind legs (between the carapace and the plastron for eggs). An x-ray can also be done to find out if the turtle is gravid or not. If the turtle is gravid, with an x-ray the vet can determine the number of eggs the female is carrying and the presence of any problematic eggs. Once you are sure that the turtle is gravid, you can start preparing for the arrival of the eggs.