The Compendium of Kāśyapa 8.10.25

8.10.25

nābhiprapīḍanatkarāt saṃkṣobhācca viśeṣataḥ
garbhiṇyāstaruṇe garbhe sraṃsanaṃ na praśasyate

especially because it compresses the navel and causes agitation. / Purgation is not praised in a pregnant woman during early pregnancy;