Jatakaparijata 13.16

13.16

śītajyotiṣi jyoṣito'nupacayasthāne kujenekṣite |
jātaṃ garbhaphalapradaṃ khalu rajaḥ syādanyathā niṣphalam |
dṛṣṭe'smin guruṇā nijopacayage kuryānnivekaṃ pumān |
atyājye ca samūlabhe śubhaguṇe parvādikālojbhite ||

When the Moon is in an un-upacaya house of a woman and aspected by Mars,
the menses that appear indeed bestow the fruit of conception; otherwise, it is fruitless.
When this [Moon] is aspected by Jupiter and situated in her own upacaya house, a man should perform impregnation,
at an auspicious time that should not be abandoned, in an unblemished asterism, endowed with benefic qualities, avoiding occasions such as the parvan days.