John Gill Commentary Genesis 38:25

"When she was brought forth, she sent to her father-in-law, saying, By the man, whose these are, am I with child: and she said, Discern, I pray thee, whose are these, the signet, and the cords, and the staff." — Genesis 38:25 (ASV)

When she [was] brought forth from her father's house, not to the place of execution, or in order to be burnt, but to the court of judicature, in order to take tier trial:

she sent to her father in law, saying, by the man whose these [are], am] I with child; she sent a messenger to him, and by him the signet, bracelets, and staff, be they what they may, she had received from him as a pledge for the kid he promised her; and ordered the messenger to say, at the same time he showed him these things, that she was with child by the person to whom they belonged; which was a very modest way of laying it to his charge, and yet very striking and convincing:

and she said; by the messenger she sent: discern, I pray thee, whose [are] these, the signet, and bracelets, and staff; which were the things given her as a pledge till she received the kid, the hire she was to have for his lying with her.