In the second and third lines, the speaker playfully refers to her increase in size due to being pregnant. She feels like an elephant or a melon on two tendrils (two legs). The third line refers to these images and reveals that the speaker, while seemingly playful, has conflicted emotions about being pregnant. To humans, the inside fruit is the valuable part of the melon and the ivory is the valuable part of the elephant. The speaker compares herself as the relatively worthless receptacle carrying the supposedly more valuable items; the fruit and ivory clearly being compared to the child.