The Compendium of Caraka 4.8.36

4.8.36

tasyāstu khalvimāni liṅgāni prajananakālamabhito bhavanti; tadyathā---klamo gātrāṇāṃ, glānirānanasya, akṣṇoḥ śaithilyaṃ, vimuktabandhanatvamiva vakṣasaḥ, kukṣeravasraṃsanam, adhogurutvaṃ, vaṃkṣaṇabastikaṭīkukṣipārśvapṛṣṭhanistodaḥ, yoneḥ prasravaṇam, anannābhilāṣaśceti; tato 'anantaramāvīnāṃ prādurbhāvaḥ, prasekaśca garbhodakasya//

Her signs near the time of giving birth are indeed these: namely, exhaustion of the limbs, languor of the face, slackness of the eyes, a feeling as if the bindings of the chest are loosened, sagging of the abdomen, heaviness in the lower part, piercing pain in the groins, bladder, pelvis, abdomen, flanks, and back, discharge from the vagina, and loss of appetite for food; immediately following that, the appearance of labor pains and the pouring out of the amniotic fluid.