Vishvamitrasmriti 8.57

8.57

niṣphalāyāśca gurviṇyā na bhoktavyaṃ kadācana
raṇḍāpañcavidhaṃ jñātvā prayatnena parityajet

and by a woman whose womb is fruitless, or a pregnant woman, must never be eaten. / Knowing the fivefold widow, one should avoid [her food] with effort.