Revākhaṇḍa ascribed to the Vāyupurāṇa (RKV) 20.52

20.52

tadante ca mahābhāge garbhādhānaṃ dvitīyakam /
puṃsavanaṃ tṛtīyaṃ tu sīmantaṃ ca caturthakam //

After that, O illustrious lady, garbhādhāna is the second; / puṃsavana is the third, and sīmanta is the fourth;